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de Vries FE, Gül A, Mesina-Estarrón I, Mekary RA, Vleggeert-Lankamp CLA. Evaluation of bony fusion after anterior cervical discectomy: a systematic literature review and meta-analysis. Neurosurg Rev 2025; 48:386. [PMID: 40274684 PMCID: PMC12021957 DOI: 10.1007/s10143-025-03542-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2025] [Revised: 04/10/2025] [Accepted: 04/18/2025] [Indexed: 04/26/2025]
Abstract
Significant variability exists in reported fusion rates in the cervical spine after anterior discectomy. Here we review fusion assessment methods, timing of fusion with various intervertebral devices, and examine correlations with clinical outcomes. PubMed, Medline, Embase, Web of Science, Cochrane Library, and Emcare were searched on December 9 2024 for studies involving 1- or 2-level anterior cervical discectomy with quantitative fusion assessment via CT or X-ray. A meta-analysis was conducted using a random-effects model to pool fusion rates and their 95% confidence intervals (CIs) at different follow-up points, for different cage types and different cut-off values evaluating fusion. Sixty-four included studies evaluated 5633 patients. Pooled fusion rates increased over time: 55.6% (95% CI: 43.5%, 67.2%) of patients demonstrated fusion at three months, 74.4% (67.6%, 80.1%) at six months, 88.1% at 12 months (85.1%, 90.6%), and 91.8% (89.1%, 93.9%) at 24 months. Subgroup analysis revealed variation in fusion rates depending on cage type, with titanium cages yielding slightly higher rates at all follow-up times. Sensitivity analysis with fusion criteria showed that a cut-off value < 2 mm for interspinous distance yielded lower fusion rates than the cut-off < 2° for Cobb angle at 6 (70% vs. 77.3%), 12 (83.9% vs. 91.1%) and 24 months (89.5% vs. 91.7%). Results on the correlation between fusion and clinical outcomes were inconsistent. Fusion rates improved over time, approaching 56% at 3 months and 90% at 12 months. Notably, to alleviate heterogeneity across studies, there is a dire need to harmonize reporting guidelines in future research.
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Affiliation(s)
- Floor E de Vries
- Department of Neurosurgery, Leiden University Medical Center (LUMC), Albinusdreef 2, Leiden, 2333 ZA, The Netherlands.
- Computational Neuroscience Outcomes Center at Harvard, Department of Neurosurgery, Brigham and Women's Hospital, 75 Francis St, Boston, MA, 02115, USA.
| | - Azra Gül
- Department of Neurosurgery, Leiden University Medical Center (LUMC), Albinusdreef 2, Leiden, 2333 ZA, The Netherlands
| | - Ignacio Mesina-Estarrón
- Computational Neuroscience Outcomes Center at Harvard, Department of Neurosurgery, Brigham and Women's Hospital, 75 Francis St, Boston, MA, 02115, USA
- Harvard Medical School, 25 Shattuck St, Boston, MA, 02115, USA
| | - Rania A Mekary
- Computational Neuroscience Outcomes Center at Harvard, Department of Neurosurgery, Brigham and Women's Hospital, 75 Francis St, Boston, MA, 02115, USA
- Department of Pharmaceutical Business and Administrative Sciences, School of Pharmacy, MCPHS University, 179 Longwood Ave, Boston, MA, 02115, USA
| | - Carmen L A Vleggeert-Lankamp
- Department of Neurosurgery, Leiden University Medical Center (LUMC), Albinusdreef 2, Leiden, 2333 ZA, The Netherlands
- Computational Neuroscience Outcomes Center at Harvard, Department of Neurosurgery, Brigham and Women's Hospital, 75 Francis St, Boston, MA, 02115, USA
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Meng H, Jin T, Wang J, Ji X, Peng Z, Qi M, Zhang C, Duan W, Chen Z. Comparison of Interbody Fusion Strategies in Anterior Cervical Discectomy and Fusion: A Network Meta-Analysis and Systematic Review. World Neurosurg 2024; 190:65-75. [PMID: 38942142 DOI: 10.1016/j.wneu.2024.06.117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2024] [Revised: 06/21/2024] [Accepted: 06/22/2024] [Indexed: 06/30/2024]
Abstract
OBJECTIVE The optimal choice for fusion strategy in Anterior Cervical Discectomy and Fusion (ACDF) remains an unresolved issue. This study aims to perform a network meta-analysis and systematic review of fusion rate and complication rate of various fusion strategies used in ACDF. METHODS This study followed Prisma guidelines, and we searched PubMed, Embase, Cochrane Library, and Web of Science from inception to November 11, 2022, for Randomized Controlled trials comparing the efficacy and safety of fusion modalities in ACDF. The primary outcome was the fusion rate and complication rate. The PROSPERO number is CRD42022374440. RESULTS This meta-analysis identified 26 Randomized Controlled trial studies with 1789 patients across 15 fusion methods. The cage with autograft + plating showed the highest fusion rate, surpassing other methods like iliac crest bone graft (ICBG) and artificial bone graft (AFG). The stand-alone cage with autograft (SATG) had the second highest fusion rate. Regarding complication rate, the cage with AFG (CAFG) had the highest rate, more than other methods. The ICBG had a higher complication rate compared to ICBG + P, AFG, stand-alone cage with artificial bone graft, SATG, and CALG. The SATG performed well in both fusion and complication rate. CONCLUSIONS In this study, we conducted the first network meta-analysis to compare the efficacy and safety of various fusion methods in ACDF. Our findings suggest that SATG, with superior performance in fusion rate and complication rate, may be the optimal choice for ACDF. However, the results should be interpreted cautiously until additional research provides further evidence.
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Affiliation(s)
- Hongfeng Meng
- Department of Neurosurgery, Xuanwu Hospital, Capital Medical University, Beijing, China; Lab of Spinal Cord Injury and Functional Reconstruction, China International Neuroscience Institute (CHINA-INI), Beijing, China
| | - Tianyu Jin
- Department of Neurosurgery, Xuanwu Hospital, Capital Medical University, Beijing, China; Lab of Spinal Cord Injury and Functional Reconstruction, China International Neuroscience Institute (CHINA-INI), Beijing, China
| | - Jialu Wang
- Department of Neurosurgery, Xuanwu Hospital, Capital Medical University, Beijing, China; Lab of Spinal Cord Injury and Functional Reconstruction, China International Neuroscience Institute (CHINA-INI), Beijing, China
| | - Xiangtian Ji
- Department of Neurosurgery, Xuanwu Hospital, Capital Medical University, Beijing, China; Lab of Spinal Cord Injury and Functional Reconstruction, China International Neuroscience Institute (CHINA-INI), Beijing, China
| | - Zhiyuan Peng
- Department of Neurosurgery, Xuanwu Hospital, Capital Medical University, Beijing, China; Lab of Spinal Cord Injury and Functional Reconstruction, China International Neuroscience Institute (CHINA-INI), Beijing, China
| | - Maoyang Qi
- Department of Neurosurgery, Xuanwu Hospital, Capital Medical University, Beijing, China; Lab of Spinal Cord Injury and Functional Reconstruction, China International Neuroscience Institute (CHINA-INI), Beijing, China
| | - Can Zhang
- Department of Neurosurgery, Xuanwu Hospital, Capital Medical University, Beijing, China; Lab of Spinal Cord Injury and Functional Reconstruction, China International Neuroscience Institute (CHINA-INI), Beijing, China
| | - Wanru Duan
- Department of Neurosurgery, Xuanwu Hospital, Capital Medical University, Beijing, China; Lab of Spinal Cord Injury and Functional Reconstruction, China International Neuroscience Institute (CHINA-INI), Beijing, China
| | - Zan Chen
- Department of Neurosurgery, Xuanwu Hospital, Capital Medical University, Beijing, China; Lab of Spinal Cord Injury and Functional Reconstruction, China International Neuroscience Institute (CHINA-INI), Beijing, China.
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Li Y, Su T, Meng T, Song D, Yin H. The fusion rates at different times of cortical iliac crest autograft or allograft compared with cages after anterior cervical discectomy and fusion: a meta-analysis. EUROPEAN SPINE JOURNAL : OFFICIAL PUBLICATION OF THE EUROPEAN SPINE SOCIETY, THE EUROPEAN SPINAL DEFORMITY SOCIETY, AND THE EUROPEAN SECTION OF THE CERVICAL SPINE RESEARCH SOCIETY 2024; 33:1148-1163. [PMID: 38319436 DOI: 10.1007/s00586-023-08118-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2023] [Revised: 11/21/2023] [Accepted: 12/22/2023] [Indexed: 02/07/2024]
Abstract
OBJECTIVE The cortical iliac crest autograft (CICA)/structural allograft (SA) has still been recognized as the gold standard for the ACDF technique for its high degree of histocompatibility and osteoinduction ability though the flourishing and evolving cage development. However, there was no further indication for using CICA/SA in ACDF based on basic information of inpatients. Our operative experience implied that applying CICA/SA has an advantage on faster fusion but not the long-term fusion rate. Therefore, our study aimed to compare the fusion rates between CICA and cage, between SA and cage, and between CICA/CA and cage. METHODS Based on the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA), a comprehensive literature search of electronic databases including PubMed, Embase, Cochrane Library and Web of Science was conducted to identify these clinical trials that investigated the postoperative 3, 6, 12 and 24 months fusion rates of CICA/structural SA versus cage. Assessment of risk of bias, data extraction and statistical analysis were then carried out by two independent authors with the resolve-by-consensus method. The primary outcome was fusion rate at 3, 6, 12 and 24 months postoperatively. The secondary outcomes were also meta-analyzed such as hardware complications, operative duration and hospitalization time. Our meta-analysis was registered with PROSPERO (Identifier: CRD42022345247). RESULT A total of 3451 segments (2398 patients) derived from 34 studies were included after the screening of 3366 articles. The segmental fusion rates of CICA were higher than cages at 3 (P = 0.184, I2 = 40.9%) and 6 (P = 0.147, I2 = 38.8%) months postoperatively, but not 12 (P = 0.988, I2 = 0.0%) and 24 (P = 0.055, I2 = 65.6%) months postoperatively. And there was no significant difference in segmental fusion rates between SA and cage at none of 3 (P = 0.047, I2 = 62.2%), 6 (P = 0.179, I2 = 41.9%) and 12 (P = 0.049, I2 = 58.0%) months after operations. As for secondary outcomes, the CICA was inferior to cages in terms of hardware complications, operative time, blood loss, hospitalization time, interbody height, disk height and Odom rating. The hardware complication of using SA was significantly higher than the cage, but not the hospitalization time, disk height, NDI and Odom rating. CONCLUSION Applying CICA has an advantage on faster fusion than using a cage but not the long-term fusion rate in ACDF. Future high-quality RCTs regarding the hardware complications between CICA and cage in younger patients are warranted for the deduced indication.
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Affiliation(s)
- Yongai Li
- Department of Orthopedics, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, 100 Haining Road, Hongkou District, Shanghai, China
| | - Tong Su
- Department of Orthopedics, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, 100 Haining Road, Hongkou District, Shanghai, China
| | - Tong Meng
- Department of Orthopedics, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, 100 Haining Road, Hongkou District, Shanghai, China
| | - Dianwen Song
- Department of Orthopedics, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, 100 Haining Road, Hongkou District, Shanghai, China
| | - Huabin Yin
- Department of Orthopedics, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, 100 Haining Road, Hongkou District, Shanghai, China.
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Muthu S, Viswanathan VK, Rodrigues-Pinto R, Cabrera JP, Ćorluka S, Martin CT, Collins MJ, Agarwal N, Wu Y, Wang JC, Meisel HJ, Buser Z. Do the Choice of Fusion Construct With and Without Autograft Influence the Fusion and Complication Rates in Patients Undergoing 1 or 2-Level Anterior Cervical Discectomy and Fusion Surgery? A PRISMA-Compliant Network Meta-Analysis. Global Spine J 2024; 14:59S-69S. [PMID: 36723507 PMCID: PMC10913905 DOI: 10.1177/21925682231154488] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
STUDY DESIGN Network meta-analysis. OBJECTIVES To compare the fusion outcome and complications of different 1 or 2-level anterior cervical decompression and fusion (ACDF) constructs performed with and without the application of autografts. METHODS We performed an independent and duplicate search in electronic databases including PubMed, Embase, Web of Science, Cochrane, and Scopus for relevant articles published between 2000 and 2020. We included comparative studies reporting fusion rate and complications with and without the use of autografts in ACDF across 5 different fusion constructs. A network meta-analysis was performed in Stata, categorized based on the type of fusion constructs utilized. Fusion constructs were ranked based on p-score approach and surface under cumulative ranking curve (SUCRA) scores. The confidence of results from the analysis was appraised with Cochrane's CINeMA approach. RESULTS A total of 2216 patients from 22-studies including 6 Randomized Controlled Trials (RCTs) and 16 non-RCTs were included in network analysis. The mean age of included patients was 49.3 (±3.62) years. Based on our meta-analysis, we could conclude that use of autograft in 1- or 2-level ACDF did not affect the fusion and mechanical implant-related complications. The final fusion and mechanical complication rates were also not significantly different across the different fusion constructs. The use of plated constructs was associated with a significant increase in post-ACDF dysphagia rates [OR 3.42; 95%CI (.01,2.45)], as compared to stand-alone constructs analysed. CONCLUSION The choice of fusion constructs and use of autografts does not significantly affect the fusion and overall complication rates following 1 or 2-level ACDF surgery.
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Affiliation(s)
- Sathish Muthu
- Department of Orthopaedics, Government Medical College, Dindigul, India
- Orthopaedic Research Group, Coimbatore, India
| | - Vibhu Krishnan Viswanathan
- Orthopaedic Research Group, Coimbatore, India
- Department of Musculoskeletal Oncology, University of Calgary, Calgary, AB, Canada
| | - Ricardo Rodrigues-Pinto
- Spinal Unit (UVM), Department of Orthopaedics, Centro Hospitalar Universitário do Porto, Porto, Portugal
- Portugal Instituto de Ciências Biomédicas Abel Salazar, Universidade do Porto, Porto, Portugal
- Hospital CUF Trindade, Porto, Portugal
| | - Juan P Cabrera
- Department of Neurosurgery, Hospital Clínico Regional de Concepción, Concepción, Chile
| | - Stipe Ćorluka
- Spinal Surgery Division, Department of Traumatology, University Hospital Centre Sestre Milosrdnice, Zagreb, Croatia
- Department of Anatomy and Physiology, University of Applied Health Sciences, Zagreb, Croatia
| | - Christopher T Martin
- Department of Orthopaedic Surgery, University of Minnesota, Minneapolis, MN, USA
| | - Michael J Collins
- Department of Orthopedic Surgery, Tulane University, New Orleans, LA, USA
- Department of Neurosurgery, Tulane University, New Orleans, LA, USA
| | - Neha Agarwal
- Department of Neurosurgery, BG Klinikum Bergmannstrost Halle, Germany
| | - Yabin Wu
- Research Department, AO Spine, AO Foundation, Davos, Switzerland
| | - Jeffrey C Wang
- Department of Orthopaedic Surgery, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
- Department of Neurosurgery, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Hans Jörg Meisel
- Department of Neurosurgery, BG Klinikum Bergmannstrost Halle, Germany
| | - Zorica Buser
- Gerling Institute, Brooklyn, NY, USA
- Department of Orthopedic Surgery, NYU Grossman School of Medicine, New York, NY, USA
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Hsueh LL, Yeh YC, Lu ML, Luo CA, Chiu PY, Lai PL, Niu CC. The impact of over-distraction on adjacent segment pathology and cage subsidence in anterior cervical discectomy and fusion. Sci Rep 2023; 13:18493. [PMID: 37898696 PMCID: PMC10613266 DOI: 10.1038/s41598-023-44998-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2023] [Accepted: 10/14/2023] [Indexed: 10/30/2023] Open
Abstract
Over-distraction has been shown to be a risk factor for cage subsidence and postoperative neck pain after anterior cervical discectomy and fusion (ACDF). Biomechanical studies have demonstrated increased adjacent segment intradiscal pressure after ACDF. The purpose of this study is to determine if over-distraction of the index disc has an effect on adjacent segment pathology. A consecutive series of 145 patients who received primary ACDF for cervical degenerative pathologies from January 2010 to December 2017 were retrospectively reviewed. The patients were divided into: (1) Over-distraction group (postoperative-preoperative index disc height ≥ 2 mm), and (2) No-distraction group (postoperative-preoperative index disc height < 2 mm). Outcome measures included radiographic parameters, Japanese Orthopaedic Association (JOA) score, and incidences of cage subsidence, radiological and clinical adjacent segment pathologies (RASP and CASP) were compared between the two groups preoperatively, postoperatively, and at the final follow-up. The two groups were comparable with respect to age, follow-up length, JOA score, incidence of CASP, and radiographic parameters. The Over-distraction group (83 patients; 115 levels) had smaller preoperative index disc height (4.5 vs. 5.2 mm, p < 0.001), but taller postoperative index disc height (7.7 vs. 6.6 mm, p < 0.001) than No-distraction group (62 patients; 90 levels) Furthermore, significantly higher incidences of cage subsidence (47% vs. 31%, p = 0.04) and RASP (any progression: 48% vs. 15%, p < 0.001; progress ≥ 2 grades: 25% vs. 7%, p = 0.001) were observed in the Over-distraction group. The multivariate analysis indicated that over-distraction and multilevel fusion were independent risk factors for RASP. There were no clinical outcome differences between the Over-distraction group and the No-distraction group in ACDF. Over-distraction of the index level of ≥ 2 mm should be avoided because it significantly increases the incidences of RASP and cage subsidence.
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Affiliation(s)
- Lan-Li Hsueh
- Department of Orthopedic Surgery, Chang Gung Memorial Hospital, Linkou Branch, No.5, Fuxing St., Guishan Dist., Taoyuan City 333, Taiwan, ROC
- Bone and Joint Research Center, Chang Gung Memorial Hospital, Linkou Branch, No.5, Fuxing St., Guishan Dist., Taoyuan City 333, Taiwan, ROC
- College of Medicine, Chang Gung University, No. 259, Wenhua 1st Rd., Guishan Dist., Taoyuan City 333, Taiwan, ROC
| | - Yu-Cheng Yeh
- Department of Orthopedic Surgery, Chang Gung Memorial Hospital, Linkou Branch, No.5, Fuxing St., Guishan Dist., Taoyuan City 333, Taiwan, ROC
- Bone and Joint Research Center, Chang Gung Memorial Hospital, Linkou Branch, No.5, Fuxing St., Guishan Dist., Taoyuan City 333, Taiwan, ROC
- College of Medicine, Chang Gung University, No. 259, Wenhua 1st Rd., Guishan Dist., Taoyuan City 333, Taiwan, ROC
| | - Meng-Ling Lu
- College of Medicine, Chang Gung University, No. 259, Wenhua 1st Rd., Guishan Dist., Taoyuan City 333, Taiwan, ROC
- Department of Orthopedic Surgery, Chang Gung Memorial Hospital, Kaohsiung Branch, No. 123, DAPI Rd., Niaosong Dist, Kaohsiung City 833, Taiwan, ROC
| | - Chi-An Luo
- Department of Orthopedic Surgery, Chang Gung Memorial Hospital, Linkou Branch, No.5, Fuxing St., Guishan Dist., Taoyuan City 333, Taiwan, ROC
- Bone and Joint Research Center, Chang Gung Memorial Hospital, Linkou Branch, No.5, Fuxing St., Guishan Dist., Taoyuan City 333, Taiwan, ROC
- College of Medicine, Chang Gung University, No. 259, Wenhua 1st Rd., Guishan Dist., Taoyuan City 333, Taiwan, ROC
| | - Ping-Yeh Chiu
- Department of Orthopedic Surgery, Chang Gung Memorial Hospital, Linkou Branch, No.5, Fuxing St., Guishan Dist., Taoyuan City 333, Taiwan, ROC
- Bone and Joint Research Center, Chang Gung Memorial Hospital, Linkou Branch, No.5, Fuxing St., Guishan Dist., Taoyuan City 333, Taiwan, ROC
- College of Medicine, Chang Gung University, No. 259, Wenhua 1st Rd., Guishan Dist., Taoyuan City 333, Taiwan, ROC
| | - Po-Liang Lai
- Department of Orthopedic Surgery, Chang Gung Memorial Hospital, Linkou Branch, No.5, Fuxing St., Guishan Dist., Taoyuan City 333, Taiwan, ROC
- Bone and Joint Research Center, Chang Gung Memorial Hospital, Linkou Branch, No.5, Fuxing St., Guishan Dist., Taoyuan City 333, Taiwan, ROC
- College of Medicine, Chang Gung University, No. 259, Wenhua 1st Rd., Guishan Dist., Taoyuan City 333, Taiwan, ROC
| | - Chi-Chien Niu
- Department of Orthopedic Surgery, Chang Gung Memorial Hospital, Linkou Branch, No.5, Fuxing St., Guishan Dist., Taoyuan City 333, Taiwan, ROC.
- Bone and Joint Research Center, Chang Gung Memorial Hospital, Linkou Branch, No.5, Fuxing St., Guishan Dist., Taoyuan City 333, Taiwan, ROC.
- College of Medicine, Chang Gung University, No. 259, Wenhua 1st Rd., Guishan Dist., Taoyuan City 333, Taiwan, ROC.
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Wang X, Zhou K, Li Y, Xie H, Wang B. Preparation, modification, and clinical application of porous tantalum scaffolds. Front Bioeng Biotechnol 2023; 11:1127939. [PMID: 37082213 PMCID: PMC10110962 DOI: 10.3389/fbioe.2023.1127939] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Accepted: 03/22/2023] [Indexed: 04/07/2023] Open
Abstract
Porous tantalum (Ta) implants have been developed and clinically applied as high-quality implant biomaterials in the orthopedics field because of their excellent corrosion resistance, biocompatibility, osteointegration, and bone conductivity. Porous Ta allows fine bone ingrowth and new bone formation through the inner space because of its high porosity and interconnected pore structure. It contributes to rapid bone integration and long-term stability of osseointegrated implants. Porous Ta has excellent wetting properties and high surface energy, which facilitate the adhesion, proliferation, and mineralization of osteoblasts. Moreover, porous Ta is superior to classical metallic materials in avoiding the stress shielding effect, minimizing the loss of marginal bone, and improving primary stability because of its low elastic modulus and high friction coefficient. Accordingly, the excellent biological and mechanical properties of porous Ta are primarily responsible for its rising clinical translation trend. Over the past 2 decades, advanced fabrication strategies such as emerging manufacturing technologies, surface modification techniques, and patient-oriented designs have remarkably influenced the microstructural characteristic, bioactive performance, and clinical indications of porous Ta scaffolds. The present review offers an overview of the fabrication methods, modification techniques, and orthopedic applications of porous Ta implants.
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Affiliation(s)
| | | | | | - Hui Xie
- *Correspondence: Hui Xie, ; Benjie Wang,
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Zhang J, Wang S, Tang X, Xiong W, Wu H, Liu C, Li F. Clinical and radiological comparison of the zero-profile anchored cage and traditional cage-plate fixation in single-level anterior cervical discectomy and fusion. Eur J Med Res 2022; 27:189. [PMID: 36175990 PMCID: PMC9523971 DOI: 10.1186/s40001-022-00813-w] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2022] [Accepted: 09/10/2022] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The aim of this study was to compare the clinical outcomes and radiographic parameters of the zero-profile anchored cage and traditional cage-plate fixation in single-level anterior cervical discectomy and fusion (ACDF). METHODS Between January 2016 and November 2018, a total of 68 patients with degenerative cervical spondylosis who underwent single-level ACDF were evaluated in this retrospective study. Thirty-five patients were treated with the zero-profile anchored cage (Zero-P group), and 33 patients were treated with the traditional cage-plate fixation (Cage group). The two groups were compared in reference to clinical outcomes and radiographic parameters. RESULTS The mean operation time in the Zero-P group was significantly shorter than that in the Cage group. The incidence of postoperative dysphagia in the Cage group was higher than that in the Zero-P group at 3 months and 12 months postoperatively. No bony spurs were found in the Zero-P group, whereas 5 patients in the Cage group developed bony spurs. There were no statistically significant differences between the two groups in the JOA scores, VAS scores, NDI scores, C2-7 Cobb angles, segmental Cobb angles, total interbody height or fusion rates at 3 months or 12 months postoperatively. CONCLUSION In this study, both the zero-profile anchored cage and traditional cage-plate fixation were demonstrated to be effective and safe strategies. Given the lower incidence of dysphagia and degenerative changes, zero-profile anchored cage is a good option.
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Affiliation(s)
- Jun Zhang
- Department of Orthopedics, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Jiefang Avenue 1095, Wuhan, 430030, People's Republic of China.,Department of Orthopedics, The First Affiliated Hospital of Kunming Medical University, Kunming Medical University, Xichang Road 295, Kunming, 650000, People's Republic of China
| | - Shanxi Wang
- Department of Orthopedics, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Jiefang Avenue 1095, Wuhan, 430030, People's Republic of China
| | - Xiangyu Tang
- Department of Radiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Jiefang Avenue 1095, Wuhan, 430030, People's Republic of China
| | - Wei Xiong
- Department of Orthopedics, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Jiefang Avenue 1095, Wuhan, 430030, People's Republic of China
| | - Hua Wu
- Department of Orthopedics, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Jiefang Avenue 1095, Wuhan, 430030, People's Republic of China
| | - Chaoxu Liu
- Department of Orthopedics, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Jiefang Avenue 1095, Wuhan, 430030, People's Republic of China.
| | - Feng Li
- Department of Orthopedics, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Jiefang Avenue 1095, Wuhan, 430030, People's Republic of China.
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Gao QY, Wei FL, Zhu KL, Zhou CP, Zhang H, Cui WX, Li T, Qian JX, Hao DJ. Clinical Efficacy and Safety of Surgical Treatments in Patients With Pure Cervical Radiculopathy. Front Public Health 2022; 10:892042. [PMID: 35910906 PMCID: PMC9330161 DOI: 10.3389/fpubh.2022.892042] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2022] [Accepted: 06/21/2022] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Traditionally paired meta-analysis revealed inconsistencies in the safety and effectiveness of surgical interventions. We conducted a network meta-analysis to assess various treatments' clinical efficacy and safety for pure cervical radiculopathy. METHODS The Embase, PubMed, and Cochrane Library databases were searched for randomized controlled trials (RCTs) comparing different treatment options for patients with pure cervical radiculopathy from inception until October 23, 2021. The primary outcomes were postoperative success rates, postoperative complication rates, and postoperative reoperation rates. The pooled data were subjected to a random-effects consistency model. The protocol was published in PROSPERO (CRD42021284819). RESULTS This study included 23 RCTs (n = 1,844) that evaluated various treatments for patients with pure cervical radiculopathy. There were no statistical differences between treatments in the consistency model in terms of major clinical effectiveness and safety outcomes. Postoperative success rates were higher for anterior cervical foraminotomy (ACF: probability 38%), posterior cervical foraminotomy (PCF: 24%), and anterior cervical discectomy with fusion and additional plating (ACDFP: 21%). Postoperative complication rates ranked from high to low as follows: cervical disc replacement (CDR: probability 32%), physiotherapy (25%), ACF (25%). Autologous bone graft (ABG) had better relief from arm pain (probability 71%) and neck disability (71%). Among the seven surgical interventions with a statistical difference, anterior cervical discectomy with allograft bone graft plus plating (ABGP) had the shortest surgery time. CONCLUSIONS According to current results, all surgical interventions can achieve satisfactory results, and there are no statistically significant differences. As a result, based on their strengths and patient-related factors, surgeons can exercise discretion in determining the appropriate surgical intervention for pure cervical radiculopathy.Systematic Review Registration: CRD42021284819.
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Affiliation(s)
- Quan-You Gao
- Health Science Center of Xi'an Jiaotong University, Xi'an, China
- Department of Orthopedics, Tangdu Hospital, Fourth Military Medical University, Xi'an, China
- Department of Spine Surgery, Honghui Hospital, Xi'an Jiao Tong University, Xi'an, China
| | - Fei-Long Wei
- Department of Orthopedics, Tangdu Hospital, Fourth Military Medical University, Xi'an, China
| | - Kai-Long Zhu
- Department of Orthopedics, Tangdu Hospital, Fourth Military Medical University, Xi'an, China
| | - Cheng-Pei Zhou
- Department of Orthopedics, Tangdu Hospital, Fourth Military Medical University, Xi'an, China
| | - Hu Zhang
- School of Basic Medicine, Fourth Military Medical University, Xi'an, China
| | - Wen-Xing Cui
- Department of Neurosurgery, Tangdu Hospital, Fourth Military Medical University, Xi'an, China
| | - Tian Li
- School of Basic Medicine, Fourth Military Medical University, Xi'an, China
| | - Ji-Xian Qian
- Department of Orthopedics, Tangdu Hospital, Fourth Military Medical University, Xi'an, China
| | - Ding-Jun Hao
- Department of Spine Surgery, Honghui Hospital, Xi'an Jiao Tong University, Xi'an, China
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9
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Abstract
Pseudarthrosis of the cervical spine represents a common and challenging problem for spine surgeons. Rates vary greatly from as low as 0%-20% to >60% and depend heavily on patient factors, approach, and number of levels. While some patients remain asymptomatic from pseudarthrosis, many require revision surgery due to instability, continued neck pain, or radiculopathy/myelopathy. We aimed to provide a practical, narrative review of cervical pseudarthrosis to address the following areas: (1) definitions, (2) incidence, (3) risk factors, (4) presentation and workup, (5) treatment decision-making, and (6) postoperative care. It is our hope the current review provides a concise summary for how to diagnose and treat challenging cervical nonunions.
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Affiliation(s)
- Scott L Zuckerman
- Department of Neurosurgery, Vanderbilt University Medical Center, Nashville, TN
- Department of Orthopedic Surgery, Columbia University Medical Center, New York, NY
| | - Clinton J Devin
- Steamboat Orthopedic and Spine Institute, Steamboat Springs, CO
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10
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Couch BK, Wawrose RA, LeVasseur CM, Pitcairn SW, Shaw JD, Donaldson WF, Lee JY, Anderst WJ. Residual Motion and Graft Type Do Not Influence Patient-reported Outcomes Following One- or Two-level Anterior Cervical Discectomy and Fusion. Spine (Phila Pa 1976) 2021; 46:E817-E825. [PMID: 34228692 DOI: 10.1097/brs.0000000000003918] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
STUDY DESIGN Prospective cohort. OBJECTIVE The aim of this study was to determine the effect of graft type on residual motion and the relationship among residual motion, smoking, and patient-reported outcome (PRO) scores following anterior cervical discectomy and fusion (ACDF). SUMMARY OF BACKGROUND DATA Although most patients develop solid fusion based on static imaging following ACDF, dynamic imaging has revealed that many patients continue to have residual motion at the arthrodesis. METHODS Forty-eight participants performed dynamic neck flexion/extension and axial rotation within a biplane radiography system 1 year following ACDF (21 one-level, 27 two-level). PRO scores included the Short Form-36, Neck Disability Index, and Cervical Spine Outcomes Questionnaire. An automated model-based tracking process matched subject-specific bone models to the biplane radiographs with sub-millimeter accuracy. Residual motion was measured across the entire arthrodesis site for both one- and two-level fusions in patients who received either allograft or autograft. Patients were divided into "pseudarthrosis" (>3° of flexion/extension residual motion) and "solid fusion" groups. Residual motion and PROs were compared between groups using Student t tests. RESULTS Patients who received allograft showed more total flexion/extension residual motion (4.1° vs. 2.8°, P = 0.12), although this failed to reach significance. No differences were noted in PROs based on graft type (all P > 0.08) or the presence of pseudarthrosis (all P > 0.13). No differences were noted in residual motion between smokers and nonsmokers (all P > 0.15); however, smokers who received allograft reported worse outcomes than nonsmokers who received allograft and smokers who received autograft. CONCLUSION Allograft may result in slightly more residual motion at the arthrodesis site 1 year after ACDF. However, there is minimal evidence that PROs are adversely affected by slightly increased residual motion, suggesting that the current definition of pseudarthrosis correlates poorly with clinically significant findings. Additionally, autograft appears to result in superior outcomes in patients who smoke.Level of Evidence: 2.
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Affiliation(s)
- Brandon K Couch
- Department of Orthopedic Surgery, University of Pittsburgh Medical Center, Pittsburgh, PA
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11
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Fiani B, Jarrah R, Shields J, Sekhon M. Enhanced biomaterials: systematic review of alternatives to supplement spine fusion including silicon nitride, bioactive glass, amino peptide bone graft, and tantalum. Neurosurg Focus 2021; 50:E10. [PMID: 34062502 DOI: 10.3171/2021.3.focus201044] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2020] [Accepted: 03/22/2021] [Indexed: 11/06/2022]
Abstract
OBJECTIVE Spinal fusions are among the most common and effective spinal surgical practices; however, the current model presents some cost and safety concerns within the patient population. Therefore, enhanced biomaterials have been presented to be an innovative yet underutilized tool to supplement the success of spinal fusion surgery. Herein, the authors discuss these biomaterials, their compositions, clinical outcomes, and cost analysis through a systematic review of the literature to date. METHODS This systematic review was conducted using the PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) criteria and guidelines. Article selection was performed using the PubMed electronic bibliographic databases. The search yielded 1168 articles that were assessed and filtered for relevance by the four authors. Following the screening of titles and abstracts, 62 articles were deemed significant enough for final selection. RESULTS To date, silicon nitride, bioactive glass, amino peptide bone grafts, and tantalum are all biomaterials that could have significant roles in supporting spinal fusion. Their unique compositions allow them to be biocompatible in the spine, and their mechanisms of action stimulate osteoblast formation and support fusion success. Moreover, these biomaterials also present positive clinical and cost outcomes that support their application in spinal procedures. However, further studies with longer follow-ups are necessary to fully understand these biomaterials prior to their incorporation in mainstream spinal practice. CONCLUSIONS The combination of their positive clinical outcomes, biocompatibility, and cost-effectiveness makes these biomaterials valuable, innovative, and effective treatment modalities that could revolutionize the current model of spinal fusion.
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Affiliation(s)
- Brian Fiani
- 1Department of Neurosurgery, Desert Regional Medical Center, Palm Springs, California
| | - Ryan Jarrah
- 2College of Arts and Sciences, University of Michigan-Flint
| | - Jennifer Shields
- 3College of Human Medicine, Michigan State University, East Lansing; and
| | - Manraj Sekhon
- 4William Beaumont School of Medicine, Oakland University, Rochester, Michigan
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12
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Huang G, Pan ST, Qiu JX. The Clinical Application of Porous Tantalum and Its New Development for Bone Tissue Engineering. MATERIALS (BASEL, SWITZERLAND) 2021; 14:2647. [PMID: 34070153 PMCID: PMC8158527 DOI: 10.3390/ma14102647] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/09/2021] [Revised: 05/06/2021] [Accepted: 05/13/2021] [Indexed: 12/13/2022]
Abstract
Porous tantalum (Ta) is a promising biomaterial and has been applied in orthopedics and dentistry for nearly two decades. The high porosity and interconnected pore structure of porous Ta promise fine bone ingrowth and new bone formation within the inner space, which further guarantee rapid osteointegration and bone-implant stability in the long term. Porous Ta has high wettability and surface energy that can facilitate adherence, proliferation and mineralization of osteoblasts. Meanwhile, the low elastic modulus and high friction coefficient of porous Ta allow it to effectively avoid the stress shield effect, minimize marginal bone loss and ensure primary stability. Accordingly, the satisfactory clinical application of porous Ta-based implants or prostheses is mainly derived from its excellent biological and mechanical properties. With the advent of additive manufacturing, personalized porous Ta-based implants or prostheses have shown their clinical value in the treatment of individual patients who need specially designed implants or prosthesis. In addition, many modification methods have been introduced to enhance the bioactivity and antibacterial property of porous Ta with promising in vitro and in vivo research results. In any case, choosing suitable patients is of great importance to guarantee surgical success after porous Ta insertion.
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Affiliation(s)
| | | | - Jia-Xuan Qiu
- Department of Oral and Maxillofacial Surgery, The First Affiliated Hospital of Nanchang University, Nanchang 330006, China; (G.H.); (S.-T.P.)
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13
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Broekema AEH, Groen RJM, Simões de Souza NF, Smidt N, Reneman MF, Soer R, Kuijlen JMA. Surgical Interventions for Cervical Radiculopathy without Myelopathy: A Systematic Review and Meta-Analysis. J Bone Joint Surg Am 2020; 102:2182-2196. [PMID: 32842045 DOI: 10.2106/jbjs.20.00324] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
BACKGROUND The effectiveness of surgical interventions for cervical degenerative disorders has been investigated in multiple systematic reviews. Differences in study population (e.g., patients with myelopathy and/or radiculopathy) were often neglected. Therefore, the objective of this study was to investigate the effectiveness of surgical interventions for patients with symptoms of cervical radiculopathy without myelopathy by conducting a systematic review and meta-analysis based on randomized controlled trials (RCTs). METHODS A comprehensive systematic search was conducted in MEDLINE, Embase, and CENTRAL (Cochrane Central Register of Controlled Trials) to identify RCTs that investigated the effectiveness of surgical interventions using an anterior or posterior approach compared with other interventions for patients with pure cervical radiculopathy. Outcomes were success rates (Odom criteria, similar rating scales, or percentage of patients who improved), complication and reoperation rates, work status, disability (Neck Disability Index), and pain (arm and neck). The Cochrane risk-of-bias tool was used to assess the likelihood of the risk of bias. A random-effects model was used. Heterogeneity among study results (I2 ≥ 50% or p < 0.05) was explored by conducting subgroup analyses. Funnel plots were used to assess the likelihood of publication bias. RESULTS A total of 21 RCTs were included, comprising 1,567 patients. For all outcomes, among all surgical techniques, only 1 pooled estimate showed a significant effect on success rate, which was in favor of anterior cervical discectomy with fusion compared with anterior cervical discectomy without an intervertebral spacer (p = 0.02; risk ratio [RR] = 0.87; 95% confidence interval [CI] = 0.77 to 0.98). Complication rates were higher when autologous bone graft from the iliac crest was used as an intervertebral spacer (p < 0.01; RR = 3.40; 95% CI = 1.56 to 7.43), related to donor-site morbidity. CONCLUSIONS This meta-analysis demonstrated consistent results regarding clinical outcome for pure cervical radiculopathy among all studied interventions. Complication and reoperation rates were also similar, with the exception of higher complication rates in patients in whom autologous bone grafts were used. On the basis of clinical outcome and safety, there is no superior surgical intervention for pure cervical radiculopathy. LEVEL OF EVIDENCE Therapeutic Level I. See Instructions for Authors for a complete description of levels of evidence.
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Affiliation(s)
- Anne E H Broekema
- Departments of Neurosurgery (A.E.H.B., R.J.M.G., N.F.S.d.S., and J.M.A.K.), Epidemiology (N.S.), and Rehabilitation (M.F.R.), and Pain Center (R.S.), University Medical Center Groningen, University of Groningen, Groningen, the Netherlands
| | - Rob J M Groen
- Departments of Neurosurgery (A.E.H.B., R.J.M.G., N.F.S.d.S., and J.M.A.K.), Epidemiology (N.S.), and Rehabilitation (M.F.R.), and Pain Center (R.S.), University Medical Center Groningen, University of Groningen, Groningen, the Netherlands
| | - Nádia F Simões de Souza
- Departments of Neurosurgery (A.E.H.B., R.J.M.G., N.F.S.d.S., and J.M.A.K.), Epidemiology (N.S.), and Rehabilitation (M.F.R.), and Pain Center (R.S.), University Medical Center Groningen, University of Groningen, Groningen, the Netherlands
| | - Nynke Smidt
- Departments of Neurosurgery (A.E.H.B., R.J.M.G., N.F.S.d.S., and J.M.A.K.), Epidemiology (N.S.), and Rehabilitation (M.F.R.), and Pain Center (R.S.), University Medical Center Groningen, University of Groningen, Groningen, the Netherlands
| | - Michiel F Reneman
- Departments of Neurosurgery (A.E.H.B., R.J.M.G., N.F.S.d.S., and J.M.A.K.), Epidemiology (N.S.), and Rehabilitation (M.F.R.), and Pain Center (R.S.), University Medical Center Groningen, University of Groningen, Groningen, the Netherlands
| | - Remko Soer
- Departments of Neurosurgery (A.E.H.B., R.J.M.G., N.F.S.d.S., and J.M.A.K.), Epidemiology (N.S.), and Rehabilitation (M.F.R.), and Pain Center (R.S.), University Medical Center Groningen, University of Groningen, Groningen, the Netherlands.,Saxion University of Applied Sciences, Enschede, the Netherlands
| | - Jos M A Kuijlen
- Departments of Neurosurgery (A.E.H.B., R.J.M.G., N.F.S.d.S., and J.M.A.K.), Epidemiology (N.S.), and Rehabilitation (M.F.R.), and Pain Center (R.S.), University Medical Center Groningen, University of Groningen, Groningen, the Netherlands
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14
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Park PJ, Lehman RA. Optimizing the Spinal Interbody Implant: Current Advances in Material Modification and Surface Treatment Technologies. Curr Rev Musculoskelet Med 2020; 13:688-695. [PMID: 32816234 DOI: 10.1007/s12178-020-09673-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
PURPOSE OF REVIEW Interbody implants allow for fusion of the anterior column of the spine between vertebral body endplates. As rates of spinal fusion surgery have increased over the past several years, significant research has been devoted to optimizing both the mechanical and biologic properties of the interbody implant in order to promote bony fusion. The first interbody implants used decades ago were fashioned from cortical autograft. Currently, titanium alloy and polyetheretherketone (PEEK) are the most widely used and studied materials for this purpose. This review focuses on recent innovations in material modification and surface treatment techniques for both titanium and PEEK implants to maximize fusion rates in spinal surgery. RECENT FINDINGS Titanium has an elastic modulus much higher than native bone and however has better osseointegrative properties than PEEK. PEEK, however, has an elastic modulus closer to that of bone without any of the advantageous biologic properties that titanium has. Increasing porosity and surface roughness of titanium implants have been shown to improve the mechanical properties of titanium implants, while the biologic properties of PEEK have been enhanced using surface coating technology, either with titanium or with hydroxyapatite (HA). Techniques such as increasing porosity, surface roughening, and surface coating are just some of the recent innovations aimed at optimizing both mechanical and biologic properties of interbody implants to promote spinal fusion. The future of interbody implant design will rely on continued improvements of PEEK and titanium implants as well as exploring new implant materials altogether.
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Affiliation(s)
- Paul J Park
- The Spine Hospital, NewYork-Presbyterian/Columbia University Irving Medical Center, 5141 Broadway, 3 Field West-022, New York, NY, 10034, USA.
| | - Ronald A Lehman
- The Spine Hospital, NewYork-Presbyterian/Columbia University Irving Medical Center, 5141 Broadway, 3 Field West-022, New York, NY, 10034, USA
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15
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Oitment C, Watson T, Lam V, Aref M, Koziarz A, Kachur E, Badhiwala JH, Almenawer SA, Cenic A. The Role of Anterior Cervical Discectomy and Fusion on Relieving Axial Neck Pain in Patients With Single-Level Disease: A Systematic Review and Meta-Analysis. Global Spine J 2020; 10:312-323. [PMID: 32313797 PMCID: PMC7160803 DOI: 10.1177/2192568219837923] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
STUDY DESIGN Systematic review and meta-analysis. OBJECTIVES This study aims to evaluate the effects of anterior cervical decompression and fusion (ACDF) on axial neck pain in adult patients receiving surgery for myelopathy, radiculopathy, or a combination of both. METHODS Two independent reviewers completed a librarian-assisted search of 4 databases. Visual Analogue Scale (VAS) and Neck Disability Index (NDI) scores were extracted preoperatively and at 3, 6, 12, 24, 36, 48, and 48+ months postoperatively for ACDF groups and pooled using a random-effects model. RESULTS Of 17 850 eligible studies, 37 were included for analysis, totaling 2138 patients analyzed with VAS and 2477 with NDI score. Individual VAS mean differences were reduced at 6 weeks (-2.5 [95% confidence interval (CI): -3.5 to -1.6]), 3 months (-2.9 [-3.7 to -2.2]), 6 months (-3.2 [-3.9 to -2.6]), 12 months (-3.7 [-4.3 to -3.1]), 24 months (-4.0 [-4.4 to -3.5]), 48 months (-4.6 [-5.5 to -3.8]), and >48 months (-4.7 [-5.8 to -3.6]) follow-up (P < .0001 for all endpoints). Individual NDI mean differences were reduced at 6 weeks (-26.7 [-30.9 to -22.6]), 3 months (-29.8 [-32.7 to -26.8]), 6 months (-31.2 [-35.5 to -26.8)], 12 months (-29.3 [-33.2 to -25.4]), 24 months (-28.9 [-32.6 to -25.2]), 48 months (-33.1 [-37.4 to -28.7]), and >48 months (-37.6 [-45.9 to -29.3]) follow-up (P < .0001 for all endpoints). CONCLUSIONS ACDF is associated with a significant reduction in axial neck pain compared with preoperative values in patients being treated specifically for myelopathy or radiculopathy. This influences the preoperative discussions surgeons may have with patients regarding their expectations for surgery. The effects seen are stable over time and represent a clinically significant reduction in axial neck pain.
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Affiliation(s)
| | | | - Victor Lam
- University of Western Ontario, London, Ontario, Canada
| | | | - Alex Koziarz
- McMaster University, Hamilton, Ontario, Canada,University of Toronto, Toronto, Ontario, Canada
| | | | | | | | - Aleksa Cenic
- McMaster University, Hamilton, Ontario, Canada,Aleksa Cenic, Division of Neurosurgery, Hamilton
Health Sciences, 237 Barton St E, Hamilton, Ontario L8L 2X2, Canada.
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16
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Patel MS, McCormick JR, Ghasem A, Huntley SR, Gjolaj JP. Tantalum: the next biomaterial in spine surgery? JOURNAL OF SPINE SURGERY 2020; 6:72-86. [PMID: 32309647 DOI: 10.21037/jss.2020.01.01] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Tantalum is a porous metal, whose elastic modulus, high frictional properties and biocompatibility make it an ideal construct to facilitate adequate bony fusion in spine surgery. Since 2015, the published literature on clinical outcomes of tantalum in spine surgery has more than doubled. A review of the literature was performed on the PubMed (MEDLINE) database on January 27, 2019, for papers pertinent to the use of tantalum metal in spine surgery. Thirteen studies were included in this review. For cervical spine, we found increased fusion rates in autograft alone compared to tantalum standalone (92.8% vs. 89.0%, P=0.001) and tantalum cages plus autograft (92.8% vs. 64.8%, P<0.0001). Complication rates in cervical fusion were lower in patients treated with tantalum standalone versus those treated with autograft (7.4% vs. 13.7%, P<0.0001), and autograft and anterior plate (7.4% vs. 33%, P=0.001). Autograft patients had higher rates of revision surgery compared to tantalum standalone (12.8% vs. 2.8%, P<0.0001) and tantalum ring with autograft (12.8% vs. 7.7%, P<0.001). For lumbar spine, we found autograft had lower fusion rate compared to tantalum standalone (80.0% vs. 93.4%, P<0.0001). Use of tantalum metal in spine fusion surgery shows promising results in fusion, complication and revision rates, and clinical outcomes compared to autograft. Although, fusion rates in short-term studies evaluating tantalum in the cervical spine are conflicting, long-term series beyond 2 years show excellent results. This early finding may be related difficulties in radiographic evaluation of fusion in the setting of tantalum cage use. Further studies are needed to further delineate the timing of fusion with the implementation of tantalum in the cervical and lumbar spine.
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Affiliation(s)
- Manan Sunil Patel
- The University of Miami Leonard M. Miller School of Medicine, Miami, FL, USA
| | | | - Alexander Ghasem
- Department of Orthopedic Surgery, University of Miami Hospital, Miami, FL, USA
| | - Samuel R Huntley
- The University of Miami Leonard M. Miller School of Medicine, Miami, FL, USA.,Department of Orthopedic Surgery, University of Miami Hospital, Miami, FL, USA
| | - Joseph P Gjolaj
- Department of Orthopedic Surgery, University of Miami Hospital, Miami, FL, USA
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17
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Tantalum Fusion Device in Anterior Cervical Discectomy and Fusion For Treatment of Cervical Degeneration Disease: A Systematic Review and Meta-Analysis. Clin Spine Surg 2020; 33:111-119. [PMID: 31634174 DOI: 10.1097/bsd.0000000000000875] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
STUDY DESIGN This is a systematic review and meta-analysis study. OBJECTIVE The purpose of this systematic review and meta-analysis study is to evaluate the outcomes of a tantalum fusion device in anterior cervical discectomy and fusion (ACDF) for the treatment of cervical degeneration disease. SUMMARY OF BACKGROUND DATA A great interest has raised for porous tantalum in cervical fusion, but several studies reported the divergent clinical outcome and fusion rate. No systematic review and meta-analysis has been conducted up to present to evaluate the outcomes of the tantalum fusion device. METHODS We comprehensively searched multiple databases for studies that investigated the tantalum fusion device in ACDF. The retrieved results were last updated on February 15, 2018. Outcomes of interest comprised of operative parameters, fusion rate, the incidence of adverse events as well as patient-reported outcomes, including the Neck Disability Index (NDI) score, Visual Analog Scale (VAS) score, Short Form-36 Physical Component Scores and complications. RESULTS Ten studies included were included in this review and 6 randomized controlled trial studies included. All studies were pooled to evaluate the outcome of fusion rate, NDI, and VAS after tantalum fusion treatment. The results of the meta-analysis showed that implantation of the tantalum fusion device is associated with significantly shorter operative and fewer adverse events when compared with autologous iliac crest bone graft. However, no difference was found with regards to the fusion rate, NDI, VAS, and global assessment. CONCLUSIONS Through this systemic review and meta-analysis, no significant difference was found with regards to fusion rate, postoperative NDI, and VAS between tantalum fusion and iliac crest bone graft in ACDF. More longer-term and randomized studies with large samples are warranted to validate any association found in this study. LEVEL OF EVIDENCE Level II.
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Lebhar J, Kriegel P, Chatellier P, Breton Y, Ropars M, Huten D. Tantalum implants for posterior lumbar interbody fusion: A safe method at medium-term follow-up? Orthop Traumatol Surg Res 2020; 106:269-274. [PMID: 32169394 DOI: 10.1016/j.otsr.2019.10.028] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/04/2019] [Revised: 09/25/2019] [Accepted: 10/15/2019] [Indexed: 02/03/2023]
Abstract
INTRODUCTION Intervertebral implants increase stability and improve results in lumbar interbody fusion (LIF). The aim of the present study was to assess clinical and radiological results of posterior lumbar interbody fusion (PLIF) using a tantalum intervertebral implant without associated interbody bone graft. MATERIEL AND METHODS A single-center retrospective study included 52 cases of single-level PLIF, using 2 tantalum intervertebral cages, without interbody bone graft: 42 for degenerative disc disease, 10 for isthmic spondylolisthesis. Minimum follow-up was 2 years. Clinical assessment used a visual analog (pain) scale (VAS), the Oswestry Disability Index (ODI) and the Roland Morris (RM) scale. Tantalum osseointegration and intersegment mobility were assessed on static and dynamic X-ray. RESULTS Forty-nine patients were included, with a mean 55months' follow-up (range, 25-74months). VAS, ODI and RM scores showed significant improvement at last-follow-up, at 4, 30 and 28 points respectively. There was no mechanical failure on static X-ray; all patients had less than 5° mobility on dynamic X-ray at last follow-up. DISCUSSION PLIF with tantalum intervertebral implant without interbody bone graft provided satisfactory clinical and radiological results at medium-term follow-up. The present findings showed reliable primary stability and osseointegration of the tantalum implant. LEVEL OF EVIDENCE IV.
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Affiliation(s)
- Jonathan Lebhar
- Chirurgie Orthopédique et Traumatologique, Centre Hospitalo-Universitaire de Rennes, 2, Rue Henri-le-Guilloux, 35000 Rennes, France.
| | - Pierre Kriegel
- Chirurgie Orthopédique et Traumatologique, Centre Hospitalo-Universitaire de Rennes, 2, Rue Henri-le-Guilloux, 35000 Rennes, France
| | - Patrick Chatellier
- Chirurgie Orthopédique et Traumatologique, Centre Hospitalo-Universitaire de Rennes, 2, Rue Henri-le-Guilloux, 35000 Rennes, France
| | - Yann Breton
- Chirurgie Orthopédique et Traumatologique, Centre Hospitalo-Universitaire de Rennes, 2, Rue Henri-le-Guilloux, 35000 Rennes, France
| | - Mickael Ropars
- Chirurgie Orthopédique et Traumatologique, Centre Hospitalo-Universitaire de Rennes, 2, Rue Henri-le-Guilloux, 35000 Rennes, France
| | - Denis Huten
- Chirurgie Orthopédique et Traumatologique, Centre Hospitalo-Universitaire de Rennes, 2, Rue Henri-le-Guilloux, 35000 Rennes, France
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19
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Role of MRI in the assessment of interbody fusion with tantalum intervertebral implant. Orthop Traumatol Surg Res 2020; 106:285-289. [PMID: 32169395 DOI: 10.1016/j.otsr.2019.11.018] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/04/2019] [Revised: 11/14/2019] [Accepted: 11/19/2019] [Indexed: 02/03/2023]
Abstract
INTRODUCTION Radiologic assessment of interbody fusion (IF) is controversial; thin-slice CT is the present gold standard despite artifacts due to the metal implant that hinder interpretation. The present study aimed to assess the contribution of MRI in IF assessment after instrumented posterior lumbar interbody fusion (PLIF) using tantalum intervertebral implants. The study hypothesis was that fusion following PLIF can be assessed on MRI. MATERIALS AND METHOD A single-center retrospective study included 52 single-level PLIF procedures (42 for degenerative disc disease and 10 for isthmic spondylolisthesis) using 2 tantalum intervertebral cages without interbody bone graft. Fusion was assessed at 1 year on static and dynamic X-ray and on MRI with a dedicated protocol. Two senior osteoarticular radiologists screened frontal and sagittal MRI slices for continuous cancellous interbody bridges. Consolidation was considered acquired (grade I) in case of continuous bridges on at least 2 successive frontal or sagittal slices, possible (grade II) in case of continuous bridge on just 1 slice, or absent (grade III) in case of no or discontinuous bridge. RESULTS Forty-eight patients were included, with a mean 55 months' follow-up (range, 25-74 months). There were no hardware failures. Intervertebral mobility on dynamic X-ray was systematically less than 5°. Fusion on MRI was grade I in 71% of cases, grade II in 8% and grade III in 21%. Interobserver agreement was 100% on X-ray and 81% on MRI, with kappa coefficient=0.56 (range, 0.35-0.77). DISCUSSION Tantalum implants without bone autograft enabled satisfactory standard radiographic study. MRI provided imperfect assessment of fusion, being contributive only in case of positive findings (71% in the present study); when no bridge is detected on MRI, no conclusion can be drawn. Progress in CT to reduce artifacts may improve fusion assessment, unless bone integration on both sides of the implant is considered to be sufficient for interbody continuity, without a continuous bone bridge between endplates being a requirement. LEVEL OF EVIDENCE IV.
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20
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Yee TJ, Swong K, Park P. Complications of anterior cervical spine surgery: a systematic review of the literature. JOURNAL OF SPINE SURGERY 2020; 6:302-322. [PMID: 32309668 DOI: 10.21037/jss.2020.01.14] [Citation(s) in RCA: 104] [Impact Index Per Article: 20.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The anterior approach to the cervical spine is commonly utilized for a variety of degenerative, traumatic, neoplastic, and infectious indications. While many potential complications overlap with those of the posterior approach, the distinct anatomy of the anterior neck also presents a unique set of hazards. We performed a systematic review of the literature to assess the etiology, presentation, natural history, and management of these complications. Following the guidelines of the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA), a PubMed search was conducted to evaluate clinical studies and case reports of patients who suffered a complication of anterior cervical spine surgery. The search specifically included articles concerning adult human subjects, written in the English language, and published from 1989 to 2019. The PubMed search yielded 240 articles meeting our criteria. The overall rates of complications were as follows: dysphagia 5.3%, esophageal perforation 0.2%, recurrent laryngeal nerve palsy 1.3%, infection 1.2%, adjacent segment disease 8.1%, pseudarthrosis 2.0%, graft or hardware failure 2.1%, cerebrospinal fluid leak 0.5%, hematoma 1.0%, Horner syndrome 0.4%, C5 palsy 3.0%, vertebral artery injury 0.4%, and new or worsening neurological deficit 0.5%. Morbidity rates in anterior cervical spine surgery are low. Nevertheless, the unique anatomy of the anterior neck presents a wide variety of potential complications involving vascular, aerodigestive, neural, and osseous structures.
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Affiliation(s)
- Timothy J Yee
- Department of Neurosurgery, University of Michigan, Ann Arbor, MI, USA
| | - Kevin Swong
- Department of Neurosurgery, University of Michigan, Ann Arbor, MI, USA
| | - Paul Park
- Department of Neurosurgery, University of Michigan, Ann Arbor, MI, USA
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How Does Screw Migration or Fracture After Anterior Cervical Plate Fixation Affect the Radiographic and Clinical Outcomes? Clin Spine Surg 2019; 32:398-402. [PMID: 31162182 DOI: 10.1097/bsd.0000000000000844] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
STUDY DESIGN A retrospective cohort study. OBJECTIVE The objective of this article is to assess the effect of screw migration and fracture associated with anterior cervical plating on long-term radiographic and clinical outcomes. BACKGROUND DATA Screw migration and breakage detected after anterior cervical discectomy/corpectomy and fusion with plating may cause various implant-related complications and reduce solid fusion rate. However, little is known about their long-term prognosis. MATERIALS AND METHODS Medical records and radiographic data of 248 consecutive patients who underwent anterior cervical discectomy and fusion or anterior cervical corpectomy and fusion with a dynamic plating system and were followed up for ≥2 years were retrospectively reviewed. Patients who experienced screw migration or breakage were classified as screw failure group (SF group, n=25). Patients without screw loosening or fracture until the last follow-up were defined as the nonfailure group (NF group, n=223). Visual analogue scales for neck pain, arm pain, and neck disability index were assessed. Radiologic measurements were performed to analyze solid fusion. The solid union was defined as interspinous motion ≤1 mm on flexion/extension lateral x-rays. RESULTS A number of levels fused was significantly associated with increased risk of screw failure (P<0.01). A total of 13 patients in the SF group achieved solid fusion at final follow-up, although fusion rates at all postoperative time points were significantly lower in the SF group than in the NF group, including at final follow-up (P<0.01). Failures in 23 (92%) screw failure patients developed at the lowermost instrumented vertebra. The SF and NF groups experienced similar degrees of neck pain, arm pain, and neck disturbance index scores. There were no cases of complete screw extrusion or related complications requiring revision surgery. CONCLUSION Although screw failure increased the incidence of pseudarthrosis, it did not aggravate postoperative arm pain, neck pain, or neck disability. As failed implants rarely migrate to an extent that endangers tracheoesophageal structures, immediate removal is rarely necessary.
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Arnold PM, Sasso RC, Janssen ME, Fehlings MG, Heary RF, Vaccaro AR, Kopjar B. i-Factor™ Bone Graft vs Autograft in Anterior Cervical Discectomy and Fusion: 2-Year Follow-up of the Randomized Single-Blinded Food and Drug Administration Investigational Device Exemption Study. Neurosurgery 2019; 83:377-384. [PMID: 28945914 DOI: 10.1093/neuros/nyx432] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2016] [Accepted: 08/09/2017] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND i-Factor™ Bone Graft (Cerapedics Inc, Westminster, Colorado) is a composite bone substitute material consisting of P-15 synthetic collagen fragment adsorbed onto anorganic bone mineral suspended in an inert biocompatible hydrogel carrier. A pivotal, noninferiority, US FDA Investigational Device Exemption study demonstrated the benefits of i-Factor™ compared to local autograft bone in single-level anterior cervical discectomy and fusion at 1-yr postoperative. OBJECTIVE To report 2-yr follow-up. METHODS Subjects randomly received either autograft (n = 154) or i-Factor™ (n = 165) in a cortical ring allograft and followed using radiological, clinical, and patient-reported outcomes. RESULTS At 2 yr, the fusion rate was 97.30% and 94.44% in i-Factor™ and autograft subjects, respectively (P = .2513), and neurological success rate was 94.87% (i-Factor™) and 93.79% (autograft; P = .7869). Neck Disability Index improved 28.30 (i-Factor™) and 26.95 (autograft; P = .1448); Visual Analog Scale arm pain improved 5.43 (i-Factor™) and 4.97 (autograft) (p = .2763); Visual Analog Scale neck pain improved 4.78 (i-Factor™) and 4.41 (autograft; P = .1652), Short Form-36 (SF-36v2) Physical Component Score improved 10.23 (i-Factor™) and 10.18 (autograft; P = .4507), and SF36v2 Mental Component Score improved 7.88 (i-FactorTM) and 7.53 (autograft; P = .9872). The composite endpoint of overall success (fusion, Neck Disability Index improvement >15, neurological success, and absence of re-operations) was greater in i-Factor™ subjects compared to autograft subjects (69.83% and 56.35%, respectively, P = .0302). Twelve (7.45%) i-Factor™ subjects and 16 (10.53%) autograft subjects underwent re-operation (P = .3411). There were no allergic reactions associated with i-Factor™. CONCLUSION Use of i-Factor™ in anterior cervical discectomy and fusion is effective and safe, and results in similar outcomes compared to local autograft bone at 2 yr following surgery.
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Affiliation(s)
- Paul M Arnold
- Department of Neurosurgery, University of Kansas Medical Center, Kansas City, Kansas
| | | | | | - Michael G Fehlings
- Department of Neurosurgery, University of Toronto, The Toronto Western Hospital, University Health Network, Toronto, Ontario, Canada
| | - Robert F Heary
- Department of Neurological Surgery, Neurological Institute of New Jersey, Rutgers New Jersey Medical School, Newark, New Jersey
| | - Alexander R Vaccaro
- Rothman Institute Orthopaedics, Thomas Jefferson University Hospital, Philadelphia Pennsylvania
| | - Branko Kopjar
- Department of Health Services, University of Washington, Seattle, Washington
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Broekema AEH, Molenberg R, Kuijlen JMA, Groen RJM, Reneman MF, Soer R. The Odom Criteria: Validated at Last: A Clinimetric Evaluation in Cervical Spine Surgery. J Bone Joint Surg Am 2019; 101:1301-1308. [PMID: 31318810 DOI: 10.2106/jbjs.18.00370] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
BACKGROUND The Odom criteria, established in 1958, are a widely used, 4-point rating scale for assessing the clinical outcome after cervical spine surgery. Surprisingly, the Odom criteria have never been validated, to our knowledge. The aim of this study was to investigate the reliability and validity of the Odom criteria for the evaluation of surgical procedures of the cervical spine. METHODS Patients with degenerative cervical spine disease were included in the study and divided into 2 subgroups on the basis of their most predominant symptom: myelopathy or radiculopathy. Reliability was assessed with interrater and test-retest design using quadratic weighted kappa coefficients. Construct validity was assessed by means of hypotheses testing. To evaluate whether the Odom criteria could act as a global perceived effect (GPE) scale, we assessed concurrent validity by comparing area under the curve (AUC) values of receiver operating characteristic (ROC) curves for the set of questionnaires. RESULTS A total of 110 patients were included in the study; 19 were excluded, leaving 91 in our analysis. Reliability assessments showed κ = 0.77 for overall interrater reliability and κ = 0.93 for overall test-retest reliability. Interrater reliability was κ = 0.81 for the radiculopathy subgroup and κ = 0.68 for the myelopathy subgroup. At least 75% of the hypotheses were met. The AUCs showed similar characteristics between the Odom criteria and GPE scale. CONCLUSIONS The Odom criteria met the predefined criteria for reliability and validity. Therefore, the Odom criteria may be used to assess surgical outcome after a cervical spine procedure, specifically for patients presenting with radicular symptoms. The results of previous studies that have been deemed less trustworthy because of the use of the Odom criteria should be reconsidered.
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Affiliation(s)
- Anne E H Broekema
- University of Groningen, University Medical Center Groningen, Department of Neurosurgery, the Netherlands
| | - Rob Molenberg
- University of Groningen, University Medical Center Groningen, Department of Neurosurgery, the Netherlands
| | - Jos M A Kuijlen
- University of Groningen, University Medical Center Groningen, Department of Neurosurgery, the Netherlands
| | - Rob J M Groen
- University of Groningen, University Medical Center Groningen, Department of Neurosurgery, the Netherlands
| | - Michiel F Reneman
- University of Groningen, University Medical Center Groningen, Department of Rehabilitation, the Netherlands
| | - Remko Soer
- University of Groningen, University Medical Center Groningen, Groningen Spine Center, the Netherlands.,Saxion University of Applied Sciences, Enschede, the Netherlands
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Application of a novel porous tantalum implant in rabbit anterior lumbar spine fusion model: in vitro and in vivo experiments. Chin Med J (Engl) 2019; 132:51-62. [PMID: 30628959 PMCID: PMC6629310 DOI: 10.1097/cm9.0000000000000030] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
BACKGROUND Some porous materials have been developed to enhance biologic fusion of the implants to bone in spine fusion surgeries. However, there are several inherent limitations. In this study, a novel biomedical porous tantalum was applied to in vitro and in vivo experiments to test its biocompatibility and osteocompatibility. METHODS Bone marrow-derived mesenchymal stem cells (BMSCs) were cultured on porous tantalum implant. Scanning electron microscope (SEM) and Cell Counting Kit-8 assay were used to evaluate the cell toxicity and biocompatibility. Twenty-four rabbits were performed discectomy only (control group), discectomy with autologous bone implanted (autograft group), and discectomy with porous tantalum implanted (tantalum group) at 3 levels: L3-L4, L4-L5, and L5-L6 in random order. All the 24 rabbits were randomly sacrificed at the different post-operative times (2, 4, 6, and 12 months; n = 6 at each time point). Histologic examination and micro-computed tomography scans were done to evaluate the fusion process. Comparison of fusion index scores between groups was analyzed using one-way analysis of variance. Other comparisons of numerical variables between groups were made by Student t test. RESULTS All rabbits survived and recovered without any symptoms of nerve injury. Radiographic fusion index scores at 12 months post-operatively between autograft and tantalum groups showed no significant difference (2.89 ± 0.32 vs. 2.83 ± 0.38, F = 244.60, P = 0.709). Cell Counting Kit-8 assay showed no significant difference of absorbance values between the leaching liquor group and control group (1.25 ± 0.06 vs. 1.23 ± 0.04, t = -0.644, P = 0.545), which indicated the BMSC proliferation without toxicity. SEM images showed that these cells had irregular shapes with long spindles adhered to the surface of tantalum implant. No implant degradation, wear debris, or osteolysis was observed. Histologic results showed solid fusion in the porous tantalum and autologous bone implanted intervertebral spaces. CONCLUSION This novel porous tantalum implant showed a good biocompatibility and osteocompatibility, which could be a valid biomaterial for interbody fusion cages.
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Li N, Hu WQ, Xin WQ, Li QF, Tian P. Comparison between porous tantalum metal implants and autograft in anterior cervical discectomy and fusion: a meta-analysis. J Comp Eff Res 2019; 8:511-521. [PMID: 30907632 DOI: 10.2217/cer-2018-0107] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
Aim: The objective of this study was to systematically compare the safety and efficacy of porous tantalum metal (TM) implants and autograft in single-level anterior cervical discectomy and fusion. Methods: Potential academic articles were acquired from the Cochrane Library, Medline, PubMed, Embase, Science Direct and other databases. The time range used was from the inception of the electronic databases to March 2018. Gray studies were identified from the references of included literature reports. STATA version 11.0 (Stata Corporation, TX, USA) was used to analyze the pooled data. Results: Four randomized, controlled trials (RCTs) were identified according to the retrieval process. There were significant differences in operation time (mean difference [MD]: -28.846, 95% confidence interval [CI: -47.087, -10.604], p = 0.002) and satisfaction rate (odds ratio [OR]: 2.196, 95% CI: [1.061-4. 546]; p = 0.034). However, no significant difference was detected in blood loss (MD: -73.606, 95% CI: [-217.720, 70.509], p = 0.317), hospital stay (MD: -0.512, 95% CI [-1.082, 0.058]; p = 0.079), fusion rate (OR: 0.497, 95% CI [0.079, 3.115]; p = 0.455), visual analog scale (MD: -0.310, 95% CI [-0.433, -0.186]; p < 0.001) or complication rate (risk difference [RD]: -0.140, 95% CI: [-0.378, 0.099]; p = 0.251). Conclusion: Porous TM implants are equally as effective and safe as autograft in anterior cervical discectomy and fusion processes. In addition, porous TM implants could reduce operation time and improve clinical satisfaction significantly.
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Affiliation(s)
- Na Li
- Department of Orthopedics, Tianjin Medical University General Hospital, Tianjin, China, 300052
| | - Wen-Qing Hu
- Department of Rehabilitation, Tianjin Medical University General Hospital, Tianjin, China, 300052
| | - Wen-Qiang Xin
- Department of Neurosurgery, Tianjin Medical University General Hospital, Tianjin, China, 30052
| | - Qi-Feng Li
- Department of Neurosurgery, Tianjin Medical University General Hospital, Tianjin, China, 30052
| | - Peng Tian
- Department of Orthopedics, Tianjin Hospital, Tianjin, PR China, 300211
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Abstract
There are several reconstructive procedures in foot and ankle surgery wherein structural grafts are needed to fill defects, restore height, and maintain correction while providing an osteoconductive environment until fusion occurs. Traditionally used autografts and allografts have their disadvantages and limitations. Porous tantalum, with stiffness similar to bone and its biocompatibility, can be a viable option in foot and ankle reconstructive procedures.
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Noordhoek I, Koning MT, Vleggeert-Lankamp CLA. Evaluation of bony fusion after anterior cervical discectomy: a systematic literature review. EUROPEAN SPINE JOURNAL : OFFICIAL PUBLICATION OF THE EUROPEAN SPINE SOCIETY, THE EUROPEAN SPINAL DEFORMITY SOCIETY, AND THE EUROPEAN SECTION OF THE CERVICAL SPINE RESEARCH SOCIETY 2018; 28:386-399. [PMID: 30448985 DOI: 10.1007/s00586-018-5820-9] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2018] [Accepted: 11/04/2018] [Indexed: 12/14/2022]
Abstract
PURPOSE Anterior cervical discectomy and fusion (ACDF) has proven effective in treating radicular arm pain. Post-operatively, cervical spine stability is temporarily challenged, but data on bony fusion and speed of fusion are ambiguous; optimum evaluation method and criteria are debated. AIM To study bony fusion accomplishment and to obtain an overview of methods to evaluate fusion. METHODS A literature search was performed in PubMed and Embase. Included studies had to report original data concerning 1- or 2-level ACDF with intervertebral device or bone graft, where bony fusion was assessed using CT scans or X-rays. RESULTS A total of 146 articles comprising 10,208 patients were included. Bony fusion was generally defined as "the presence of trabecular bridging" and/or "the absence of motion". Fusion was accomplished in 90.1% of patients at the final follow-up. No gold standard for assessment could be derived from the results. Addition of plates and/or cages with screws resulted in slightly higher accomplishment of fusion, but differences were not clinically relevant. Eighteen studies correlated clinical outcome with bony fusion, and 3 found a significant correlation between accomplishment and better clinical outcome. CONCLUSIONS In approximately 90% of patients, bony fusion is accomplished one year after ACDF. As there is no generally accepted definition of bony fusion, different measuring techniques cannot be compared to a gold standard and it is impossible to determine the most accurate method. Variations in study design hamper conclusions on optimising the rate of bony fusion by choice of material and/or additives. Insufficient attention is paid to correlation between bony fusion and clinical outcome. These slides can be retrieved from electronic supplementary material.
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Affiliation(s)
- I Noordhoek
- Department of Neurosurgery, Leiden University Medical Centre, Albinusdreef 2, 2300 RC, Leiden, The Netherlands.
| | - M T Koning
- Department of Hematology, Leiden University Medical Centre, Leiden, The Netherlands
| | - C L A Vleggeert-Lankamp
- Department of Neurosurgery, Leiden University Medical Centre, Albinusdreef 2, 2300 RC, Leiden, The Netherlands
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Fernández-Fairen M, Alvarado E, Torres A. Eleven-Year Follow-Up of Two Cohorts of Patients Comparing Stand-Alone Porous Tantalum Cage Versus Autologous Bone Graft and Plating in Anterior Cervical Fusions. World Neurosurg 2018; 122:e156-e167. [PMID: 30268546 DOI: 10.1016/j.wneu.2018.09.160] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2018] [Revised: 09/19/2018] [Accepted: 09/20/2018] [Indexed: 12/19/2022]
Abstract
BACKGROUND Anterior cervical discectomy and fusion with a porous tantalum cage is an accepted method to treat degenerated cervical discs, with good results, similar to those with autologous bone graft and plating at short- and mid-term follow-up. However, to date, long-term follow-up studies have been performed. METHODS We performed a retrospective, single-center study to evaluate the outcomes of 2 cohorts from a previous prospective randomized controlled trial comparing stand-alone tantalum cage (group 1, 27 patients) with autologous bone graft and plating (group 2, 30 patients) for single-level anterior cervical discectomy and fusion at 11 years of follow-up. The usual clinical and radiological outcomes and "overall success," proposed by the Food and Drug Administration, were evaluated. RESULTS The improvement in clinical outcomes achieved postoperatively was maintained similarly in the 2 cohorts at 11 years of follow-up. In group 1, the cage had subsided 2-3 mm in 12 patients (44%), segmental lordosis was maintained in 16 patients (59%), adjacent segment degeneration had developed or progressed in 27 of the adjacent segments (50%) in 15 patients (56%), and postoperative nonprogressive deformation of the anterior aspect of the cage was observed in 7 (26%) and minor fragmentation in 3 (11%) patients. In group 2, segmental lordosis was maintained in 90% of the patients and adjacent segment degeneration had developed or progressed in 15 patients (50%). CONCLUSIONS These results show that the clinical and radiological outcomes achieved at mid-term follow-up using a tantalum cage for single-level anterior cervical discectomy and fusion will be maintained for 11 years postoperatively, similar to the results with autologous bone graft and plating.
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Affiliation(s)
| | - Enrique Alvarado
- Instituto de Cirugía Ortopédica y Traumatología, Clínica Tres Torres, Barcelona, Spain
| | - Ana Torres
- Servicio de Cirugía Ortopédica y Traumatología, Hospital Universitario Santa Lucía, Cartagena, Murcia, Spain
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Biomechanical testing of a β-tricalcium phosphate wedge for advancement of the tibial tuberosity. Vet Comp Orthop Traumatol 2017; 27:14-9. [DOI: 10.3415/vcot-13-04-0053] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2013] [Accepted: 09/26/2013] [Indexed: 11/17/2022]
Abstract
SummaryObjectives: to evaluate in vitro the strength of different compositions of beta-tricalcium phosphate (β-TCP) wedges in comparison with titanium foam and cages. To study the response to cyclic loading of the strongest β-TCP wedge, titanium foam and titanium cage.Methods: Compression test: Twenty-five tibiae were prepared for tibial tuberosity advancement using the modified Maquet technique. Five groups were defined depending on the material used to maintain the tibial tuberosity: Group 1 = titanium cage; Group 2 = wedges of porous titanium foam with 50% porosity (OrthoFoam®); Group 3 = blocks of biphasic synthetic bone (60% hydroxyapatite [HAP] and 40% _-TCP, porosity 80%); Group 4 = blocks of biphasic synthetic bone (60% HAP and 40% _-TCP, porosity 70%) and Group 5 = blocks of biphasic synthetic bone (65% HAP and 35% _-TCP, porosity 60%). Loads to failure were calculated for each implant. Cyclic study: Five additional tibiaes of group 1, 2 and 5 were fatigue tested from 100 to 500 N at a rate of 4 Hz for 200,000 cycles or until failure.Results: Compression test: For the five groups, the mean load at failure was 1895 N, 1917 N, 178 N, 562 N and 1370 N respectively. Cyclical study: All samples in the three groups tested withstood 200,000 cycles without failure.Clinical significance: The ideal implant to maintain tibial tuberosity advancement after the modified Maquet technique would be absorbable and allow osteoconduction and osteoinduction. As such, β-TCP wedges have many advantages and our study shows that they can withstand loads in the patellar tendon up to 500 N over 200,000 cycles in vitro and deserve more investigation.
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Preoperative Radiographic Parameters to Predict a Higher Pseudarthrosis Rate After Anterior Cervical Discectomy and Fusion. Spine (Phila Pa 1976) 2017; 42:1772-1778. [PMID: 28459780 DOI: 10.1097/brs.0000000000002219] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
STUDY DESIGN Retrospective study. OBJECTIVE To determine whether postoperative pseudarthrosis can be predicted from specific preoperative radiograph measurements. SUMMARY OF BACKGROUND DATA Various factors reportedly influence the occurrence of pseudarthrosis after anterior cervical discectomy and fusion (ACDF). However, to our knowledge, there are no reports on the relationships between preoperative radiographic parameters and pseudarthrosis. METHODS We analyzed 84 consecutive patients (45 males, 39 females, mean age, 58.9 ± 11.2 yrs) who underwent ACDF. In all patients, allografts filled with local chip bone were inserted after discectomy and anterior plating was performed. On preoperative plain radiographs, we analyzed C2-C7 sagittal vertical axis, T1 sagittal slope, segmental motion, global cervical motion, and location of fusion segments. Pseudarthrosis was diagnosed as interspinous motion >1 mm with superjacent interspinous motion ≥4 mm on magnified dynamic lateral radiographs. Multivariate logistic regression was used to analyze the risk factors for pseudarthrosis and the receiver operating characteristic (ROC) curve was used to define a cutoff value. RESULTS One hundred and twenty-five segments from 84 patients were included. The pseudarthrosis rate was 29% based on number of patients (24/84) and 20% based on number of segments (25/125). Multilevel surgery and segments at the lowest levels showed higher pseudarthrosis rates (P = 0.01). Per multivariate logistic regression analysis, greater preoperative segmental motion, greater preoperative T1 sagittal slope, and C6-7 segments were associated with a higher risk of pseudarthrosis (all P < 0.05). A segmental motion cutoff value of 12° demonstrated pseudarthrosis with sensitivity of 87%, specificity of 84%, and area under the curve of 0.899, indicating moderate accuracy. CONCLUSION Greater preoperative segmental motion, greater preoperative T1 sagittal slope, and lower fusion levels could be risk factors for pseudarthrosis following ACDF. Preoperative segmental motion >12° is likely to be an important indicator of the development of pseudarthrosis. LEVEL OF EVIDENCE 3.
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Tomé-Bermejo F, Morales-Valencia JA, Moreno-Pérez J, Marfil-Pérez J, Díaz-Dominguez E, Piñera AR, Alvarez L. Degenerative Cervical Disc Disease: Long-term Changes in Sagittal Alignment and Their Clinical Implications After Cervical Interbody Fusion Cage Subsidence: A Prospective Study With Standalone Lordotic Tantalum Cages. Clin Spine Surg 2017; 30:E648-E655. [PMID: 28525492 DOI: 10.1097/bsd.0000000000000293] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
STUDY DESIGN A retrospective, observational study of prospectively collected outcomes. OBJECTIVE To investigate the long-term clinical course of anterior cervical discectomy and fusion with interbody fusion cages (ACDF-IFC) with lordotic tantalum implants and to correlate the radiologic findings with the clinical outcomes, with special emphasis on the significance and the influence of implant subsidence. SUMMARY OF BACKGROUND DATA Cage subsidence is the most frequently reported complication after ACDF-IFC. However, most reports fail to correlate cage subsidence with lower fusion rates or with unsatisfactory clinical results. METHODS Forty-one consecutive patients with symptomatic degenerative cervical disk disease with failure of conservative treatment were included. All patients underwent 1-/2-level ACDF-IFC with lordotic tantalum implants. The mean follow-up was 4.91 years. RESULTS The final follow-up fusion rate was 96.96% (32/33). The interspace height (IH) at the affected levels was significantly incremented after implant insertion, and despite a gradual loss in the height over time, the final follow-up IH was significantly higher than that measured preoperatively (P<0.0001). Anterior IH and posterior IH lost 55.8% and 76.2% of the initially incremented height, respectively, with a final increase of 72% in the AIH-PIH height differential. Implant subsidence (>3 mm) occurred in 11 disk spaces (26.82%). Preoperative and postoperative IH were significantly higher in subsidence patients; however, there was no difference in the final follow-up IH (P>0.05). Patients with ≥3 years of follow-up (n=29) did not demonstrate further significant subsidence beyond the second year. Regarding C1-C7 lordosis, the segmental Cobb angle, the cervical Visual Analogue Scale, and Neck Disability Index questionnaires, no difference between patients with or without final follow-up endplate subsidence was encountered. CONCLUSIONS Until fusion occurs, tantalum cage settlement into the vertebral body is to be expected. Further subsidence could be the result of segmental adaptative changes. Graft subsidence did not affect the clinical outcome in any of our patients during long-term follow-up. The occurrence of dynamical implant subsidence had a positive effect on cervical lordosis, especially at the posterior IH.
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Affiliation(s)
- Félix Tomé-Bermejo
- *Spine Department, Fundación Jiménez Díaz University Hospital, Madrid †Orthopaedic Department, Virgen de la Salud Hospital ‡Clinical Research Department, Castilla-La Mancha Health Research Foundation, Toledo, Spain
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Wang T, Tian XM, Liu SK, Wang H, Zhang YZ, Ding WY. Prevalence of complications after surgery in treatment for cervical compressive myelopathy: A meta-analysis for last decade. Medicine (Baltimore) 2017; 96:e6421. [PMID: 28328846 PMCID: PMC5371483 DOI: 10.1097/md.0000000000006421] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
PURPOSE We aim to perform a meta-analysis on prevalence of all kinds of operation-related complications following surgery treating cervical compressive myelopathy (CCM) and to provide reference for surgeons making surgical plan. METHODS An extensive search of literature was performed in PubMed/MEDLINE, Embase, the Cochrane library, CNKI, and WANFANG databases on incidence of operation-related complications from January 2007 to November 2016. Data was calculated and data analysis was conducted with STATA 12.0 and Revman 5.3. RESULTS A total of 107 studies included 1705 of 8612 patients (20.1%, 95% CI 17.3%-22.8%) on overall complications. The incidence of C5 plasy, cerebrospinal fluid (CSF), infection, axial pain, dysphagia, hoarseness, fusion failure, graft subsidence, graft dislodgment, and epidural hematoma is 5.3% (95% CI 4.3%-6.2%), 1.9% (95% CI 1.3%-2.4%), 2.8% (95% CI 1.7%-4.0%), 15.6% (95% CI 11.7%-19.5%), 16.8% (95% CI 13.6%-19.9%), 4.0% (95% CI 2.3%-5.7%), 2.6% (95% CI 0.2%-4.9%), 3.7% (95% CI 2.0%-5.5%), 3.4% (95% CI 2.0%-4.8%), 1.1% (95% CI 0.7%-1.5%), respectively. Patients with ossification of posterior longitudinal ligament (OPLL) (6.3%) had a higher prevalence of C5 plasy than those with cervical spondylotic myelopathy (CSM) (4.1%), and a similar trend in CSF (12.2% vs 0.9%). Individuals after laminectomy and fusion (LF) had highest rate of C5 plasy (15.2%), while those who underwent anterior cervical discectomy and fusion (ACDF) had the lowest prevalence (2.0%). Compared with patients after other surgical options, individuals after anterior cervical corpectomy and fusion (ACCF) have the highest rate of CSF (4.2%), infection (14.2%), and epidural hematoma (3.1%). Patients after ACDF (4.8%) had a higher prevalence of hoarseness than those with ACCF (3.0%), and a similar trend for dysphagia between anterior corpectomy combined with discectomy (ACCDF) and ACCF (16.8% vs 9.9%). CONCLUSIONS Based on our meta-analysis, patients with OPLL have a higher incidence of C5 palsy and CSF. Patients after LF have a higher incidence of C5 palsy, ACCDF have a higher incidence of dysphagia, ACCF have a higher incidence of CSF and infection and ACDF have a higher incidence of hoarseness. These figures may be useful in the estimation of the probability of complications following cervical surgery.
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Affiliation(s)
- Tao Wang
- Department of Spinal Surgery, The Third Hospital of Hebei Medical University
| | - Xiao-Ming Tian
- Department of Spinal Surgery, The Third Hospital of Hebei Medical University
| | - Si-Kai Liu
- Department of Spinal Surgery, The Third Hospital of Hebei Medical University
| | - Hui Wang
- Department of Spinal Surgery, The Third Hospital of Hebei Medical University
| | - Ying-Ze Zhang
- Hebei Provincial Key Laboratory of Orthopedic Biomechanics, Shijiazhuang, China
| | - Wen-Yuan Ding
- Department of Spinal Surgery, The Third Hospital of Hebei Medical University
- Hebei Provincial Key Laboratory of Orthopedic Biomechanics, Shijiazhuang, China
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Shriver MF, Lewis DJ, Kshettry VR, Rosenbaum BP, Benzel EC, Mroz TE. Dysphagia Rates after Anterior Cervical Diskectomy and Fusion: A Systematic Review and Meta-Analysis. Global Spine J 2017; 7:95-103. [PMID: 28451514 PMCID: PMC5400168 DOI: 10.1055/s-0036-1583944] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/31/2015] [Accepted: 03/23/2016] [Indexed: 11/25/2022] Open
Abstract
STUDY DESIGN Systematic review and meta-analysis. OBJECTIVE Anterior cervical diskectomy and fusion (ACDF) is an effective surgical option for patients with cervical radiculopathy, myelopathy, or deformity. Although ACDF is generally safe, dysphagia is a common complication. Despite its high incidence, prolonged postoperative dysphagia is poorly understood; its etiology remains relatively unknown, and its risk factors are widely debated. METHODS We searched MEDLINE, Scopus, Web of Science, and Embase for studies reporting complications for cervical diskectomy with plating. We recorded dysphagia events from all included studies and calculated effect summary values, 95% confidence intervals (CIs), Q values, and I2 values. RESULTS Of the 7,780 retrieved articles, 14 met inclusion criteria. The overall dysphagia rate was 8.5% (95% CI 5.7 to 11.3%). The rate of moderate or severe dysphagia was 4.4% (0.4 to 8.4%). Follow-up times of <12, 12 to 24, and >24 months reported rates of 19.9% (6.0 to 33.7%), 7.0% (5.2 to 8.7%), and 7.6% (1.4 to 13.8%), respectively. Studies utilizing the Bazaz Dysphagia Score resulted in an increase in dysphagia diagnosis relative to studies with no outlined criteria (19.8%, 5.9 to 33.7% and 6.9%, 3.7 to 10.0%, respectively), indicating that the criteria used for dysphagia identification are critical. There was no difference in dysphagia rate with the use of autograft versus allograft. CONCLUSIONS This review represents a comprehensive estimation of the actual incidence of dysphagia across a heterogeneous group of surgeons, patients, and criteria. The classification scheme for dysphagia varied significantly within the literature. To ensure its diagnosis and identification, we recommend the use of a standardized, well-outlined method for dysphagia diagnosis.
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Affiliation(s)
- Michael F. Shriver
- School of Medicine, Case Western Reserve University, Cleveland, Ohio, United States,Address for correspondence Michael F. Shriver, BS, Case Western Reserve University School of Medicine, 2109 Adelbert Road, Cleveland, OH 44106, United States (e-mail: ).
| | | | - Varun R. Kshettry
- Department of Neurosurgery, Neurological Institute, Cleveland Clinic, Cleveland, Ohio, United States,Center for Spine Health, Cleveland Clinic, Cleveland, Ohio, United States
| | - Benjamin P. Rosenbaum
- Department of Neurosurgery, Neurological Institute, Cleveland Clinic, Cleveland, Ohio, United States,Center for Spine Health, Cleveland Clinic, Cleveland, Ohio, United States
| | - Edward C. Benzel
- Department of Neurosurgery, Neurological Institute, Cleveland Clinic, Cleveland, Ohio, United States,Center for Spine Health, Cleveland Clinic, Cleveland, Ohio, United States
| | - Thomas E. Mroz
- Center for Spine Health, Cleveland Clinic, Cleveland, Ohio, United States,Department of Orthopaedic Surgery, Cleveland Clinic, Cleveland, Ohio, United States
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The Effect of Dynamic Versus Static Plating Systems on Fusion Rates and Complications in 1-Level and/or 2-Level Anterior Cervical Discectomy and Fusion: A Systematic Review. Clin Spine Surg 2017; 30:20-26. [PMID: 27898451 DOI: 10.1097/bsd.0000000000000453] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
STUDY DESIGN A systematic review. OBJECTIVE To determine the effect of plate design on fusion rates in patients undergoing a 1- and 2-level anterior cervical discectomy and fusion (ACDF). METHODS Articles published between January 1, 2002 and January 1, 2015 were systematically reviewed to determine the fusion rate of 1- and 2-level ACDFs using either a fully constrained or semiconstrained locking plate. Additional variables that were collected included the number of levels, the type of graft/cage used, the study design, the method for determining fusion, and complications. RESULTS Fifty-two articles and 3053 patients were included. No significant difference in the fusion rate for 1- and 2-level ACDF using a fully constrained plate (96.1%) and a semiconstrained plate (95.29%) was identified (P=0.84). No difference (P=0.85) in the total complication rate between fully constrained plates (3.20%) and semiconstrained plates (3.66%), or the rate of complications that required a revision (2.17% vs. 2.41%, P=0.82) was identified. However, semiconstrained plates had a nonsignificant increase in total dysphagia rates (odds ratio=1.660, P=0.28) and short-term dysphagia rates (odds ratio=2.349, P=0.10). CONCLUSIONS In patients undergoing a 1- or 2-level ACDF, there is no significant difference in the fusion or complication rate between fully constrained plates and semiconstrained plates. LEVEL OF EVIDENCE Level II-systematic review.
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Anterior cervical discectomy and interbody fusion with porous tantalum implant. Results in a series with long-term follow-up. J Clin Neurosci 2016; 33:159-162. [DOI: 10.1016/j.jocn.2016.03.036] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2015] [Revised: 01/21/2016] [Accepted: 03/14/2016] [Indexed: 11/24/2022]
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King V, Swart A, Winder MJ. Tantalum trabecular metal implants in anterior cervical corpectomy and fusion: 2-year prospective analysis. J Clin Neurosci 2016; 32:91-4. [PMID: 27515543 DOI: 10.1016/j.jocn.2016.03.026] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2016] [Accepted: 03/26/2016] [Indexed: 10/21/2022]
Abstract
Anterior cervical decompression for two or more cervical spondylotic levels can be performed using either multiple anterior cervical discectomies and fusion or anterior cervical corpectomy and fusion (ACCF). A variety of options for ACCF implants exist but to our knowledge, there is no clinical data for the use of tantalum trabecular metal implants (TTMI) for ACCF. A retrospective review was performed of prospectively collected data for ten patients undergoing ACCF with TTMI between 2011 and 2012. Radiological outcome was assessed by measuring the change in cervical (C) lordosis (fusion Cobb and C2-C7 Cobb), graft subsidence (anterior/posterior, determined by the subsidence of anterior/posterior body height of fused segments; cranial/caudal, determined by the cranial/caudal plate-to-disc distances) and rate of fusion using lateral cervical X-rays of patients at 0, 6, 12 and 24months post-operatively. The Neck Disability Index (NDI) assessed clinical outcome pre-operatively and at 6, 12 and 24months post-operatively. Cervical lordosis (Cobb angle of fused segment) was 5.2° (± 4.2°) at 0months and 6.0° (± 5.7°) at 24months post-operatively. Graft subsidence was observed to occur at 6months post-operatively and continued throughout follow-up. Anterior, posterior and caudal subsidence occurred more in the first 12months post-operatively than in the following 12months (p<0.05). Average pre-operative NDI was 45%. Average NDIs were 18%, 13% and 10% at 6, 12 and 24months post-operatively, respectively. ACCF patients treated with TTMI demonstrated stable cervical lordosis over 2years of follow-up and 100% fusion rates after 2years. Measures of subsidence appeared to decrease with time. Patients experienced improved clinical outcomes over the 2-year period.
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Affiliation(s)
- V King
- St Vincent's Hospital, 390 Victoria Street, Darlinghurst, NSW 2010, Australia
| | - A Swart
- St Vincent's Hospital, 390 Victoria Street, Darlinghurst, NSW 2010, Australia.
| | - M J Winder
- St Vincent's Hospital, 390 Victoria Street, Darlinghurst, NSW 2010, Australia
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Phan K, Mobbs RJ. Evolution of Design of Interbody Cages for Anterior Lumbar Interbody Fusion. Orthop Surg 2016; 8:270-7. [PMID: 27627708 PMCID: PMC6584298 DOI: 10.1111/os.12259] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/28/2015] [Accepted: 02/13/2016] [Indexed: 11/28/2022] Open
Abstract
Anterior lumbar interbody fusion (ALIF) is one of the surgical procedures for the relief of chronic back pain, radiculopathy and neurogenic claudication in patients with degenerative lumbar spine disease that is refractory to conservative therapy, low-grade spondylolisthesis and pseudo arthrosis. Over the past half century, both the surgical techniques and instrumentation required for ALIF have changed significantly. In particular, the designs of ALIF cage and the materials used have evolved dramatically, the common goal being to improve fusion rates and optimize clinical outcomes. The increasing popularity of ALIF is reflected by the increasing abundance of published studies reporting clinical outcomes, surgical techniques and grafting options for ALIF. Developments in cage designs include cylindrical Bagby and Kuslich, cylindrical ray, cylindrical mesh, lumbar-tapered, polyethyl-etherketone cage and integral fixation cages. Biologic implants include bone dowels and femoral ring allografts. Methods for optimization of cage design have included cage dimensions, use of novel composite cage materials and integral fixation technologies. However, the historical development and evolution of cages used for ALIF has not been extensively documented. This article therefore aims to provide an overview of the historical basis for the anterior approach, evolution in design of ALIF cage implants and potential future research directions.
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Affiliation(s)
- Kevin Phan
- Department of Neurosurgery, NeuroSpine Surgery Research Group, Prince of Wales Private Hospital, Sydney, Australia
- Department of Neurosurgery, University of New South Wales, Sydney, Australia
- Department of Neurosurgery, Prince of Wales Hospital, Sydney, Australia
| | - Ralph J Mobbs
- Department of Neurosurgery, NeuroSpine Surgery Research Group, Prince of Wales Private Hospital, Sydney, Australia.
- Department of Neurosurgery, University of New South Wales, Sydney, Australia.
- Department of Neurosurgery, Prince of Wales Hospital, Sydney, Australia.
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Elliott CA, Fox R, Ashforth R, Gourishankar S, Nataraj A. Magnetic resonance imaging artifact following anterior cervical discectomy and fusion with a trabecular metal cage. J Neurosurg Spine 2016; 24:496-501. [DOI: 10.3171/2015.5.spine14219] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
OBJECT
This study was undertaken to evaluate the impact of postoperative MRI artifact on the assessment of ongoing spinal cord or nerve root compression after anterior cervical discectomy and fusion (ACDF) using a trabecular tantalum cage or bone autograft or allograft.
METHODS
The authors conducted a retrospective review of postoperative MRI studies of patients treated surgically for cervical disc degenerative disease or cervical instability secondary to trauma. Standard ACDF with either a trabecular tantalum cage or interbody bone graft had been performed. Postoperative MR images were shown twice in random order to each of 3 assessors (2 spine surgeons, 1 neuroradiologist) to determine whether the presence of a tantalum interbody cage and/or anterior cervical fixation plate or screws imparted MRI artifact significant enough to prevent reliable postoperative assessment of ongoing spinal cord or nerve root compression.
RESULTS
A total of 63 patients were identified. One group of 29 patients received a tantalum interbody cage, with 13 patients (45%) undergoing anterior plate fixation. A second group of 34 patients received bone auto- or allograft, with 23 (68%) undergoing anterior plate fixation. The paramagnetic implant construct artifact had minimal impact on visualization of postoperative surgical level spinal cord compression. In the cage group, 98% (171/174) of the cases were rated as assessable versus 99% in the bone graft group (201/204), with high intraobserver reliability. In contrast, for the assessment of ongoing surgical level nerve root compression, the presence of a tantalum cage significantly decreased visualization of nerve roots to 70% (121/174) in comparison with 85% (173/204) in the bone graft group (p < 0.001). When sequences using turbo spin echo (TSE), a T2-weighted axial sequence, were acquired, nerve roots were rated as assessable in 88% (69/78) of cases; when only axial T2-weighted sequences were available, the nerve roots were rated as assessable in 54% (52/96) of cases (p < 0.01). The presence of anterior plate fixation had minimal impact on visualization of the spinal cord (99% [213/216] for plated cases vs 98% [159/162] for nonplated cases; p = 1.0) or nerve roots (79% [170/216] for plated cases vs 77% [124/162] for nonplated cases; p = 0.62).
CONCLUSIONS
Interbody fusion with tantalum cage following anterior cervical discectomy imparts significant paramagnetic artifact, which significantly decreases visualization and assessment of ongoing surgical level nerve root, but not spinal cord, compression. Anterior plate constructs do not affect visualization of these structures. TSE T2-weighted sequences significantly improve nerve root visualization and should be performed as part of a standard postoperative protocol when imaging the cervical spine following interbody implantation of materials with potential for paramagnetic artifact.
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Affiliation(s)
| | - Richard Fox
- 2Department of Radiology and Diagnostic Imaging, and
| | | | - Sita Gourishankar
- 3Division of Nephrology, University of Alberta Hospital, Edmonton, Alberta, Canada
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Papadelis EA, Karampinas PK, Kavroudakis E, Vlamis J, Polizois VD, Pneumaticos SG. Isolated Subtalar Distraction Arthrodesis Using Porous Tantalum: A Pilot Study. Foot Ankle Int 2015; 36:1084-8. [PMID: 25921196 DOI: 10.1177/1071100715581450] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
BACKGROUND During reconstructive procedures of the hindfoot, a structural graft is often needed to fill gaps. To eliminate donor site morbidity and limited availability of autografts, porous tantalum was used. METHODS Eighteen patients who underwent subtalar joint distraction arthrodesis by means of trabecular metal augment were reviewed retrospectively. The results were evaluated clinically, with the American Orthopaedic Foot & Ankle Society (AOFAS) score and the visual analog scale (VAS) for pain, and were assessed radiologically. The mean follow-up period was 18 months. RESULTS Computed tomography showed sound fusion. There was a marked increase in AOFAS scores and a decrease in VAS scores. Arthrodesis was achieved in all cases with no major postoperative complications. Radiographically, there was a marked increase in all measured parameters (talocalcaneal angle, talocalcaneal height, talar declination angle), and the intraoperatively achieved correction was maintained at the last follow-up visit. CONCLUSION Our data suggest that porous tantalum may be used as a structural graft option for subtalar arthrodesis. LEVEL OF EVIDENCE Level IV, retrospective case series.
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Affiliation(s)
- Eustratios A Papadelis
- Third Department of Orthopaedics, University of Athens Medical School, KAT Hospital, Athens, Greece
| | - Panagiotis K Karampinas
- Third Department of Orthopaedics, University of Athens Medical School, KAT Hospital, Athens, Greece
| | - Eustratios Kavroudakis
- Third Department of Orthopaedics, University of Athens Medical School, KAT Hospital, Athens, Greece
| | - John Vlamis
- Third Department of Orthopaedics, University of Athens Medical School, KAT Hospital, Athens, Greece
| | - Vasilios D Polizois
- Third Department of Orthopaedics, University of Athens Medical School, KAT Hospital, Athens, Greece
| | - Spiros G Pneumaticos
- Third Department of Orthopaedics, University of Athens Medical School, KAT Hospital, Athens, Greece
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Pseudoarthrosis rates in anterior cervical discectomy and fusion: a meta-analysis. Spine J 2015; 15:2016-27. [PMID: 25982430 DOI: 10.1016/j.spinee.2015.05.010] [Citation(s) in RCA: 125] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/31/2015] [Accepted: 05/07/2015] [Indexed: 02/03/2023]
Abstract
BACKGROUND CONTEXT Anterior cervical discectomy and fusion (ACDF) is a commonly performed procedure for patients presenting with cervical radiculopathy, myelopathy, or deformity. A systematic literature review and meta-analysis of pseudoarthrosis rates associated with ACDF with plate fixation have not been previously performed. PURPOSE The purpose of this study was to identify all prospective studies reporting pseudoarthrosis rates for ACDF with plate fixation. STUDY DESIGN/SETTING This study is based on a systematic review and meta-analysis. PATIENT SAMPLE Studies reporting pseudoarthrosis rates in patients who received one-, two-, or three-level ACDF surgeries were included. OUTCOME MEASURES Outcomes of interest included reported pseudoarthrosis events after ACDF with plate fixation. METHODS We conducted a MEDLINE, SCOPUS, Web of Science, and EMBASE search for studies reporting complications for ACDF with plate fixation. We recorded pseudoarthrosis events from all included studies. A meta-analysis was performed to calculate effect summary mean values, 95% confidence intervals (CIs), Q statistics, and I(2) values. Forest plots were constructed for each analysis group. RESULTS Of the 7,130 retrieved articles, 17 met the inclusion criteria. The overall pseudoarthrosis rate was 2.6% (95% CI: 1.3-3.9). Use of autograft fusion (0.9%, 95% CI: -0.4 to 2.1) resulted in a reduced pseudoarthrosis rate compared with allograft fusion procedures (4.8%, 95% CI: 1.7-7.9). Studies were separated based on the length of follow-up: 12 to 24 and greater than 24 months. These groups reported rates of 3.1% (95% CI: 1.2-5.0) and 2.3% (95% CI: 0.1-4.4), respectively. Studies performing single-level ACDF yielded a rate of 3.7% (95% CI: 1.6-5.7). Additionally, there was a large difference in the rate of pseudoarthrosis in randomized controlled trials (4.8%, 95% CI: 2.6-7.0) versus prospective cohort studies (0.2%, 95% CI: -0.1 to 0.5), indicating that the extent of follow-up criteria affects the rate of pseudoarthrosis. CONCLUSIONS This review represents a comprehensive estimation of the actual incidence of pseudoarthrosis across a heterogeneous group of surgeons, patients, and ACDF techniques. The definition of pseudoarthrosis varied significantly within the literature. To ensure its diagnosis and prevent sequelae, standardized criteria need to be established. This investigation sets the framework for surgeons to understand the impact of surgical techniques on the rate of pseudoarthrosis.
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Porous tantalum in spinal surgery: an overview. EUROPEAN JOURNAL OF ORTHOPAEDIC SURGERY AND TRAUMATOLOGY 2015; 26:1-7. [DOI: 10.1007/s00590-015-1654-x] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2015] [Accepted: 05/14/2015] [Indexed: 10/23/2022]
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Additively manufactured porous tantalum implants. Acta Biomater 2015; 14:217-25. [PMID: 25500631 DOI: 10.1016/j.actbio.2014.12.003] [Citation(s) in RCA: 156] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2014] [Revised: 11/25/2014] [Accepted: 12/04/2014] [Indexed: 12/27/2022]
Abstract
The medical device industry's interest in open porous, metallic biomaterials has increased in response to additive manufacturing techniques enabling the production of complex shapes that cannot be produced with conventional techniques. Tantalum is an important metal for medical devices because of its good biocompatibility. In this study selective laser melting technology was used for the first time to manufacture highly porous pure tantalum implants with fully interconnected open pores. The architecture of the porous structure in combination with the material properties of tantalum result in mechanical properties close to those of human bone and allow for bone ingrowth. The bone regeneration performance of the porous tantalum was evaluated in vivo using an orthotopic load-bearing bone defect model in the rat femur. After 12 weeks, substantial bone ingrowth, good quality of the regenerated bone and a strong, functional implant-bone interface connection were observed. Compared to identical porous Ti-6Al-4V structures, laser-melted tantalum shows excellent osteoconductive properties, has a higher normalized fatigue strength and allows for more plastic deformation due to its high ductility. It is therefore concluded that this is a first step towards a new generation of open porous tantalum implants manufactured using selective laser melting.
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Rao PJ, Pelletier MH, Walsh WR, Mobbs RJ. Spine interbody implants: material selection and modification, functionalization and bioactivation of surfaces to improve osseointegration. Orthop Surg 2015; 6:81-9. [PMID: 24890288 DOI: 10.1111/os.12098] [Citation(s) in RCA: 175] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/06/2013] [Accepted: 02/18/2014] [Indexed: 01/09/2023] Open
Abstract
The clinical outcome of lumbar spinal fusion is correlated with achievement of bony fusion. Improving interbody implant bone on-growth and in-growth may enhance fusion, limiting pseudoarthrosis, stress shielding, subsidence and implant failure. Polyetheretherketone (PEEK) and titanium (Ti) are commonly selected for interbody spacer construction. Although these materials have desirable biocompatibility and mechanical properties, they require further modification to support osseointegration. Reports of extensive research on this topic are available in biomaterial-centric published reports; however, there are few clinical studies concerning surface modification of interbody spinal implants. The current article focuses on surface modifications aimed at fostering osseointegration from a clinician's point of view. Surface modification of Ti by creating rougher surfaces, modifying its surface topography (macro and nano), physical and chemical treatment and creating a porous material with high interconnectivity can improve its osseointegrative potential and bioactivity. Coating the surface with osteoconductive materials like hydroxyapatite (HA) can improve osseointegration. Because PEEK spacers are relatively inert, creating a composite by adding Ti or osteoconductive materials like HA can improve osseointegration. In addition, PEEK may be coated with Ti, effectively bio-activating the coating.
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Affiliation(s)
- Prashanth J Rao
- Neurospine Clinic, Prince of Wales Hospital, Sydney, NSW, Australia; University of New South Wales, Sydney, NSW, Australia; Surgical and Orthopaedics Research Laboratory, Sydney, NSW, Australia
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Horisberger M, Paul J, Wiewiorski M, Henninger HB, Khalifa MS, Barg A, Valderrabano V. Commercially available trabecular metal ankle interpositional spacer for tibiotalocalcaneal arthrodesis secondary to severe bone loss of the ankle. J Foot Ankle Surg 2014; 53:383-7. [PMID: 24666978 DOI: 10.1053/j.jfas.2013.11.004] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/05/2013] [Indexed: 02/03/2023]
Abstract
Retrograde tibiotalocalcaneal nailing arthrodesis has proved to be a viable salvage procedure; however, extended bone loss around the ankle has been associated with high rates of nonunion and considerable shortening of the hindfoot. We present the surgical technique and the first 2 cases in which a trabecular metal™ interpositional spacer, specifically designed for tibiotalocalcaneal nailing arthrodesis, was used. The spacer can be implanted using either an anterior or a lateral approach. An integrated hole in the spacer allows a retrograde nail to be inserted, which provides excellent primary stability of the construct. Trabecular metal™ is a well-established and well-described material used to supplement deficient bone stock in surgery of the spine, hip, and knee. It has shown excellent incorporation and reduces the need for auto- and allografts. The trabecular metal™ interpositional ankle spacer is the first trabecular metal spacer designed specifically for ankle surgery. Its shape and variable size will make it a valuable tool for reconstructing bone loss in tibiotalocalcaneal nailing arthrodesis.
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Affiliation(s)
- Monika Horisberger
- Orthopaedic Department, University Hospital of Basel, Basel, Switzerland.
| | - Jochen Paul
- Orthopaedic Department, University Hospital of Basel, Basel, Switzerland
| | - Martin Wiewiorski
- Orthopaedic Department, University Hospital of Basel, Basel, Switzerland
| | - Heath B Henninger
- Harold K. Dunn Orthopaedic Research Laboratory, Department of Orthopaedics, University of Utah, Salt Lake City, UT
| | | | - Alexej Barg
- Orthopaedic Department, University Hospital of Basel, Basel, Switzerland
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McDonald CP, Chang V, McDonald M, Ramo N, Bey MJ, Bartol S. Three-dimensional motion analysis of the cervical spine for comparison of anterior cervical decompression and fusion versus artificial disc replacement in 17 patients. J Neurosurg Spine 2014; 20:245-55. [DOI: 10.3171/2013.11.spine13392] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Object
Cervical arthroplasty with an artificial disc (AD) has emerged as an alternative to anterior cervical discectomy and fusion (ACDF) for the management of cervical spondylosis. This study aims to provide 3D motion analysis data comparing patients after ACDF and AD replacement.
Methods
Ten patients who underwent C5–6 ACDF and 7 who underwent C5–6 AD replacement were enrolled. Using biplanar fluoroscopy and a model-based track technique (accurate up to 0.6 mm and 0.6°), motion analysis of axial rotation and flexion-extension of the neck was performed. Three nonoperative segments (C3–4, C4–5, and C6–7) were assessed for both intervertebral rotation (coronal, sagittal, and axial planes) and facet shear (anteroposterior and mediolateral).
Results
There was no difference in total neck motion comparing ACDF and AD replacement for neck extension (43.3° ± 10.2° vs 44.3° ± 12.6°, p = 0.866) and rotation (36.0° ± 6.5° vs 38.2° ± 9.3°, p = 0.576). For extension, when measured as a percentage of total neck motion, there was a greater amount of rotation at the nonoperated segments in the ACDF group than in the AD group (p = 0.003). When comparing specific motion segments, greater normalized rotation was seen in the ACDF group at C3–4 (33.2% ± 4.9% vs 26.8% ± 6.6%, p = 0.036) and C6–7 (28.5% ± 6.7% vs 20.5% ± 5.5%, p = 0.009) but not at C4–5 (33.5% ± 6.4% vs 31.8% ± 4.0%, p = 0.562). For neck rotation, greater rotation was observed at the nonoperative segments in the ACDF group than in the AD group (p = 0.024), but the differences between individual segments did not reach significance (p ≥ 0.146). Increased mediolateral facet shear was seen on neck extension with ACDF versus AD replacement (p = 0.008). Comparing each segment, C3–4 (0.9 ± 0.5 mm vs 0.4 ± 0.1 mm, p = 0.039) and C4–5 (1.0 ± 0.4 mm vs 0.5 ± 0.2 mm, p = 0.022) showed increased shear while C6–7 (1.0 ± 0.4 mm vs 1.0 ± 0.5 mm, p = 0.767) did not.
Conclusions
This study illustrates increased motion at nonoperative segments in patients who have undergone ACDF compared with those who have undergone AD replacement. Further studies will be required to examine whether these changes contribute to adjacent-segment disease.
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Affiliation(s)
- Colin P. McDonald
- 1Department of Orthopedics, Herrick Davis Motion Analysis Laboratory, and
| | - Victor Chang
- 2Department of Neurosurgery, Henry Ford Health System, Detroit, Michigan
| | - Michael McDonald
- 1Department of Orthopedics, Herrick Davis Motion Analysis Laboratory, and
| | - Nicole Ramo
- 1Department of Orthopedics, Herrick Davis Motion Analysis Laboratory, and
| | - Michael J. Bey
- 1Department of Orthopedics, Herrick Davis Motion Analysis Laboratory, and
| | - Stephen Bartol
- 1Department of Orthopedics, Herrick Davis Motion Analysis Laboratory, and
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Lewis G. Properties of open-cell porous metals and alloys for orthopaedic applications. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2013; 24:2293-2325. [PMID: 23851927 DOI: 10.1007/s10856-013-4998-y] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2013] [Accepted: 06/21/2013] [Indexed: 06/02/2023]
Abstract
One shortcoming of metals and alloys used to fabricate various components of orthopaedic systems, such as the femoral stem of a total hip joint replacement and the tibial plate of a total knee joint replacement, is well-recognized. This is that the material modulus of elasticity (E') is substantially larger than that of the contiguous cancellous bone, a consequence of which is stress shielding which, in turn, has been postulated to be implicated in a cascade of events that culminates in the principal life-limiting phenomenon of these systems, namely, aseptic loosening. Thus, over the years, a host of research programs have focused on the synthesis of metallic biomaterials whose E' can be tailored to match that of cancellous bone. The present work is a review of the extant large volume of literature on these materials, which are called open-cell porous metals/alloys (or, sometimes, metal foams or cellular materials). As such, its range is wide, covering myriad aspects such as production methods, characterization studies, in vitro evaluations, and in vivo performance. The review also includes discussion of seven areas for future research, such as parametric studies of the influence of an assortment of process variables (such as the space holder material and the laser power in the space holder method and the laser-engineered net-shaping process, respectively) on various properties (notably, permeability, fatigue strength, and corrosion resistance) of a given porous metal/alloy, innovative methods of determining fatigue strength, and modeling of corrosion behavior.
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Affiliation(s)
- Gladius Lewis
- Department of Mechanical Engineering, The University of Memphis, Memphis, TN, 38152-3180, USA,
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Anterior interbody fusion of the cervical spine with Zero-P spacer: prospective comparative study-clinical and radiological results at a minimum 2 years after surgery. Spine (Phila Pa 1976) 2013; 38:E792-7. [PMID: 23524869 DOI: 10.1097/brs.0b013e3182913400] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
STUDY DESIGN A prospective study. OBJECTIVE The aim of this study was to compare clinical and radiological efficacy of anterior cervical microdiscectomy and fusion done by the newly designed low-profile interbody spacer in cases of symptomatic cervical spine spondylosis. SUMMARY OF BACKGROUND DATA There are basically 2 ways to provide interbody fusion in the degenerative cervical spine; the first is by way of an unanchored "stand-alone" bone graft or cage, and the second is with bone graft or a cage anchored with a plate. Both concepts have their own benefits as well as potential drawbacks. Low-profile angle-stable spacer Zero-P is an implant that can potentially limit the drawbacks of both these procedures. METHODS.: Prospective study collecting clinical and radiological data of 77 patients undergoing anterior cervical interbody fusion of 1 or 2 motion segments from C3-C7 was performed. Zero-P spacer was used in 44 patients (55 segments) and in 33 cases (41 segments), stabilization was done using interbody spacer and dynamic anterior cervical plate. Patients were followed a minimum of 2 years after surgery. RESULTS There was no significant difference in neck disability index values, presence of dysphagia (P = 0.308), and Cobb C values during follow-up (P = 0.051) between both groups. A significant difference in the first 2 values of Cobb S was found (P < 0.001), but the next course of Cobb S changes showed no difference in either group. No difference was found in the radiological stability during follow-up, and no revision surgery was done. CONCLUSION The results of this study confirm biomechanical assumptions associated with the Zero-P spacer. Implantation of this new cage results in setting required biomechanical conditions in the treated segment that are comparable with those when the segment is treated with a dynamic plate. However, the potential of the mentioned implant to reduce the incidence of postoperative dysphagia was not proven on this sample of patients.
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Li X, Wang L, Yu X, Feng Y, Wang C, Yang K, Su D. Tantalum coating on porous Ti6Al4V scaffold using chemical vapor deposition and preliminary biological evaluation. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2013; 33:2987-94. [PMID: 23623123 DOI: 10.1016/j.msec.2013.03.027] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2012] [Revised: 02/01/2013] [Accepted: 03/15/2013] [Indexed: 01/06/2023]
Abstract
Porous tantalum (Ta), produced via chemical vapor deposition (CVD) of commercially pure Ta onto a vitreous carbon, is currently available for use in orthopedic applications. However, the relatively high manufacturing cost and the incapability to produce customized implant using medical image data have limited its application to gain widespread acceptance. In this study, Ta film was deposited on porous Ti6Al4V scaffolds using CVD technique. Digital microscopy and scanning electron microscopy indicated that the Ta coating evenly covered the entire scaffold structure. X-ray diffraction analysis showed that the coating consisted of α and β phases of Ta. Goat mesenchymal stem cells were seeded and cultured on the Ti6Al4V scaffolds with and without coating. The tetrazolium-based colorimetric assay exhibited better cell adhesion and proliferation on Ta-coated scaffolds compared with uncoated scaffolds. The porous scaffolds were subsequently implanted in goats for 12weeks. Histological analysis revealed similar bone formation around the periphery of the coated and uncoated implants, but bone ingrowth is better within the Ta-coated scaffolds. To demonstrate the ability of producing custom implant for clinical applications via this technology, we designed and fabricated a porous Ti6Al4V scaffold with segmental mandibular shape derived from patient computerized tomography data.
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Affiliation(s)
- Xiang Li
- School of Mechanical Engineering, Shanghai Jiao Tong University, State Key Laboratory of Mechanical System and Vibration, Shanghai, 200240, China.
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In response. Spine (Phila Pa 1976) 2013. [PMID: 23202357 DOI: 10.1097/brs.0b013e31827fd744] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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Wang N, Li H, Wang J, Chen S, Ma Y, Zhang Z. Study on the anticorrosion, biocompatibility, and osteoinductivity of tantalum decorated with tantalum oxide nanotube array films. ACS APPLIED MATERIALS & INTERFACES 2012; 4:4516-4523. [PMID: 22894817 DOI: 10.1021/am300727v] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
With its excellent anticorrosion and biocompatibility, tantalum, as a promising endosseous implant or implant coating, is attracting more and more attention. For improving physicochemical property and biocompatibility, the research of tantalum surface modification has increased. Tantalum oxide (Ta(2)O(5)) nanotube films can be produced on tantalum by controlling the conditions of anodization and annealing. The objective of our present study was to investigate the influence of Ta(2)O(5) nanotube films on pure tantalum properties related with anticorrosion, protein adsorption, and biological function of rabbit bone mesenchymal stem cells (rBMSCs). The polarization curve was measured, the adsorption of bovine serum albumin and fibronectin to Ta(2)O(5) nanotubes was detected, and the morphology and actin cytoskeletons of the rBMSCs were observed via fluorescence microscopy, and the adhesion and proliferation of the rBMSCs, as well as the osteogenic differentiation potential on tantalum specimens, were examined quantificationally by MTT and real-time PCR technology. The results showed that Ta(2)O(5) nanotube films have high anticorrosion capability and can increase the protein adsorption to tantalum and promote the adhesion, proliferation, and differentiation of rBMSCs, as well as the mRNA expression of osteogenic gene such as Osterix, ALP, Collagen-I, and Osteocalcin on tantalum. This study suggests that Ta(2)O(5) nanotube films can improve the anticorrosion, biocompatibility, and osteoinduction of pure tantalum, which provides the theoretical elaboration for development of tantalum endosseous implant or implant coating to a certain extent.
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Affiliation(s)
- Na Wang
- Beijing Key Laboratory for Tooth Regeneration and Function Reconstruction of Oral Tissues, School of Stomatology, Capital Medical University, Tian Tan Xi Li No. 4, Beijing 100050, China
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