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Hong CG, Nam WD, Lee YJ, Lee DH. Effect of Osteoporosis on Clinical and Radiological Outcomes Following One-Level Anterior Cervical Discectomy and Fusion. Asian Spine J 2024; 18:182-189. [PMID: 38454751 PMCID: PMC11065514 DOI: 10.31616/asj.2023.0207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Revised: 12/07/2023] [Accepted: 12/10/2023] [Indexed: 03/09/2024] Open
Abstract
STUDY DESIGN Retrospective study. PURPOSE This study aimed to evaluate how osteoporosis affected the clinical and radiological outcomes of patients who underwent anterior cervical discectomy and fusion (ACDF) with plating. OVERVIEW OF LITERATURE The incidence of complications associated with implants is high when ACDF is performed in patients with poor bone quality. METHODS In total, 101 patients without (T-score ≥1.0, group A) and 25 with (T-score ≤-2.5, group B) osteoporosis who underwent single-level ACDF with plating were followed up for >2 years. The clinical and radiological outcomes were compared between the two groups. The fusion rate and implant-related complications were evaluated. RESULTS Although clinical outcomes such as visual analog scale scores for the arm (2.0±2.3 vs. 2.4±2.9, p=0.490) and neck pain (1.4±1.9 vs. 1.8±2.2, p=0.343) and neck disability index (7.7±7.1 vs. 9.9±7.5, p=0.225) were slightly higher in group B, no statistically significant difference was noted. Cage subsidence (13.9% vs. 16.0%, p=0.755) and plate migration (7.9% vs. 8.0%, p=1.000) rates did not differ between the two groups. The fusion rate at 1 year postoperatively was higher in group A than in group B (80.3% vs. 68.2%, p=0.139) and slightly increased in both groups (94.6% vs. 86.4%, p=0.178) at the final follow-up. CONCLUSIONS Osteoporosis did not significantly affect the rate of cage subsidence or plate migration after cervical fusion. After ACDF, increased cage subsidence and implant migration rates had no significant effect on clinical outcomes.
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Affiliation(s)
- Chul Gie Hong
- Department of Orthopaedic Surgery, Kangwon National University Hospital, Chuncheon,
Korea
| | - Woo Dong Nam
- Department of Orthopaedic Surgery, Kangwon National University Hospital, Chuncheon,
Korea
| | - Young Ju Lee
- Department of Orthopaedic Surgery, Kangwon National University Hospital, Chuncheon,
Korea
| | - Dong-Ho Lee
- Department of Orthopaedic Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul,
Korea
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Zavras AG, Dandu N, Espinoza-Orias AA, Singh K, An HS, Inoue N, Colman MW. Computed Tomography Osteoabsorptiometry Evaluation of Cervical Endplate Subchondral Bone Mineral Density. Global Spine J 2023; 13:1803-1811. [PMID: 34736350 PMCID: PMC10556913 DOI: 10.1177/21925682211050325] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
STUDY DESIGN Basic Science. OBJECTIVE Poor subchondral bone mineral density (sBMD) has been linked with subsidence of cervical interbody devices or grafts, which are traditionally placed centrally on the endplates. Considering that sBMD reflects long-term stress distributions, we hypothesize that the cervical uncovertebral joints are denser than the central endplate region. This study sought to investigate density distributions using computed tomography osteoabsorptiometry (CT-OAM). METHODS Twelve human cervical spines from C3-C7 (60 vertebrae, 120 endplates) were imaged with CT and segmented to create 3D reconstructions. The superior and inferior endplates were isolated, and the sBMD of the whole endplate, endplate center, and uncus was evaluated using CT-OAM. Density distributions were compared across the subaxial cervical spine. RESULTS The uncinate region of the inferior and superior endplates was significantly denser than the central endplate across all vertebral levels (P < .01). When comparing sBMD of the whole inferior and superior endplates, the superior endplate was significantly denser than the inferior endplate (P < .0001). However, the inferior uncus was denser than the superior uncus (P = .035). When assessing sBMD by vertebral level, peak densities were observed at C4 and C5, while C7 was, on average, significantly less dense than all other vertebrae. CONCLUSION The subchondral bone of the cervical uncovertebral joints is significantly denser than the central endplates. While the superior endplate in its entirety is denser than the inferior endplate, the inverse was true for the uncovertebral joints. This study serves as a basis for future investigations of new implant designs and their implications on subsidence.
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Affiliation(s)
| | - Navya Dandu
- Rush University Medical Center, Chicago, IL, USA
| | | | - Kern Singh
- Rush University Medical Center, Chicago, IL, USA
| | - Howard S. An
- Rush University Medical Center, Chicago, IL, USA
| | - Nozomu Inoue
- Rush University Medical Center, Chicago, IL, USA
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He J, Chen H, Wu T, Rong X, Ding C, Wang B, Liu H. Is Cervical Disc Arthroplasty an Effective Treatment for Cervical Degenerative Disease With Osteopenia? Global Spine J 2023:21925682231190612. [PMID: 37459175 DOI: 10.1177/21925682231190612] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/22/2023] Open
Abstract
STUDY DESIGN Retrospective case-control study. OBJECTIVES To evaluate postoperative outcomes of single-level cervical disc arthroplasty (CDA) in patients with osteopenia and compare these results with a matched cohort of normal bone mineral density (BMD). METHODS Patients who had undergone single-level CDA were collected and screened. Included patients were divided into the osteopenia group and the normal group. 38 eligible patients with osteopenia were included in the final analysis. Subsequently, a 1:1 match was utilized. Clinical, radiographic data, and complications were recorded. Appropriate statistical methods were applied to conduct analysis using SPSS version 24.0. RESULTS The mean follow-up time was 30.5 ± 27.3 months. The osteopenia group achieved satisfactory clinical outcomes, with no significant intergroup differences. Additionally, there were no significant differences between groups in any of the radiological parameters, either in cervical alignment or segmental height, or range of motion. The radiological incidence rate of adjacent segmental degeneration and heterotopic ossification (HO) was comparable in both groups, respectively, with a similar composition of ROM-limiting HO. However, the osteopenia group had a tendency of more implant subsidence (2.7% vs 15.2%). The logistic regression analysis showed the osteopenia group had a significantly higher incidence rate of anterior bone loss (ABL) (OR = 5.37, 95% CI: 1.50 - 19.22). CONCLUSIONS Single-level CDA for patients with osteopenia achieved similar satisfactory clinical outcomes compared with the normal BMD group. Meanwhile, the osteopenia group maintained adequate sagittal balance and segmental height. Based on this observation, this option may be feasible for selected patients with osteopenia.
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Affiliation(s)
- Junbo He
- Department of Orthopedic Surgery, Orthopedic Research Institute, West China Hospital, Sichuan University, Chengdu, China
| | - Hua Chen
- Department of Orthopedic Surgery, Orthopedic Research Institute, West China Hospital, Sichuan University, Chengdu, China
| | - Tingkui Wu
- Department of Orthopedic Surgery, Orthopedic Research Institute, West China Hospital, Sichuan University, Chengdu, China
| | - Xin Rong
- Department of Orthopedic Surgery, Orthopedic Research Institute, West China Hospital, Sichuan University, Chengdu, China
| | - Chen Ding
- Department of Orthopedic Surgery, Orthopedic Research Institute, West China Hospital, Sichuan University, Chengdu, China
| | - Beiyu Wang
- Department of Orthopedic Surgery, Orthopedic Research Institute, West China Hospital, Sichuan University, Chengdu, China
| | - Hao Liu
- Department of Orthopedic Surgery, Orthopedic Research Institute, West China Hospital, Sichuan University, Chengdu, China
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4
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Orías AAE, Sheha E, Zavras A, John P, Fitch AA, An HS, Inoue N, Colman M. CT Osteoabsorptiometry Assessment of Subchondral Bone Density Predicts Intervertebral Implant Subsidence in a Human ACDF Cadaver Model. Global Spine J 2023; 13:1374-1383. [PMID: 34313138 PMCID: PMC10416603 DOI: 10.1177/21925682211034845] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
STUDY DESIGN Cadaveric biomechanics study. OBJECTIVE Subchondral bone mineral density (sBMD) reflects the long-term mineralization and distribution of stress on joints. The use of 3-dimensional (3-D) methods to evaluate sBMD, including computed tomography osteoabsorptiometry (CT-OAM), enables the assessment of density distribution with emphasis on subchondral bone. This study sought to measure the sBMD of cervical endplates using CT-OAM and correlate it to mechanical implant subsidence in a cadaveric model. METHODS Fourteen fresh human cadaveric cervical spines were subjected to dynamic testing after single level discectomy and instrumentation using a PEEK interbody spacer. Specimens were imaged with CT 3 times: 1st) whole intact cervical spine, 2nd) after implantation, and 3 rd) after testing. These images were used to assess sBMD distributions using CT-OAM directly underneath the spacer. Subsidence was defined as the displacement of the device into the endplates. RESULTS The observed "failure mode" was consistently recorded as subsidence, with a mean of 0.45 ± 0.36 mm and 0.40 ± 0.18 mm for the C4-5 and C6-7 levels, respectively. There were no differences by level. The experimental cyclic test showed that denser endplates experienced less deformation under the same load. CONCLUSIONS This study achieved its stated aim of validating the use of CT-OAM as a method to analyze the sBMD of the cervical endplates. Studies such as this are providing new information on available technology such as CT-OAM, providing new tools for clinicians treating spinal conditions in need of augmentation and stabilization via interbody devices.
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Affiliation(s)
| | - Evan Sheha
- Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, IL, USA
| | - Athan Zavras
- Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, IL, USA
| | - Paul John
- Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, IL, USA
| | - Ashlyn A. Fitch
- Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, IL, USA
| | - Howard S. An
- Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, IL, USA
| | - Nozomu Inoue
- Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, IL, USA
| | - Matthew Colman
- Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, IL, USA
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Oezel L, Okano I, Jones C, Salzmann SN, Shue J, Adl Amini D, Moser M, Chiapparelli E, Sama AA, Carrino JA, Cammisa FP, Girardi FP, Hughes AP. MRI-based vertebral bone quality score compared to quantitative computed tomography bone mineral density in patients undergoing cervical spinal surgery. 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 2023; 32:1636-1643. [PMID: 36882579 DOI: 10.1007/s00586-023-07570-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Revised: 01/18/2023] [Accepted: 01/30/2023] [Indexed: 03/09/2023]
Abstract
PURPOSE The vertebral bone quality (VBQ) score based on magnetic resonance imaging (MRI) was introduced as a bone quality marker in the lumbar spine. Prior studies showed that it could be utilized as a predictor of osteoporotic fracture or complications after instrumented spine surgery. The objective of this study was to evaluate the correlation between VBQ scores and bone mineral density (BMD) measured by quantitative computer tomography (QCT) in the cervical spine. METHODS Preoperative cervical CT and sagittal T1-weighted MRIs from patients undergoing ACDF were retrospectively reviewed and included. The VBQ score in each cervical level was calculated by dividing the signal intensity of the vertebral body by the signal intensity of the cerebrospinal fluid on midsagittal T1-weighted MRI images and correlated with QCT measurements of the C2-T1 vertebral bodies. A total of 102 patients (37.3% female) were included. RESULTS VBQ values of C2-T1 vertebrae strongly correlated with each other. C2 showed the highest VBQ value [Median (range) 2.33 (1.33, 4.23)] and T1 showed the lowest VBQ value [Median (range) 1.64 (0.81, 3.88)]. There was significant weak to moderate negative correlations between and VBQ Scores for all levels [C2: p < 0.001; C3: p < 0.001; C4: p < 0.001; C5: p < 0.004; C6: p < 0.001; C7: p < 0.025; T1: p < 0.001]. CONCLUSION Our results indicate that cervical VBQ scores may be insufficient in the estimation of BMDs, which might limit their clinical application. Additional studies are recommended to determine the utility of VBQ and QCT BMD to evaluate their potential use as bone status markers.
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Affiliation(s)
- Lisa Oezel
- Spine Care Institute, Hospital for Special Surgery, 535 East 70th Street, New York, NY, 10021, USA
- Department of Orthopedic Surgery and Traumatology, University Hospital Duesseldorf, Moorenstr. 5, 40225, Duesseldorf, Germany
| | - Ichiro Okano
- Spine Care Institute, Hospital for Special Surgery, 535 East 70th Street, New York, NY, 10021, USA
| | - Conor Jones
- Spine Care Institute, Hospital for Special Surgery, 535 East 70th Street, New York, NY, 10021, USA
| | - Stephan N Salzmann
- Spine Care Institute, Hospital for Special Surgery, 535 East 70th Street, New York, NY, 10021, USA
- Department of Orthopedics and Trauma Surgery, Medical University of Vienna, Waehringer Guertel 18-20, 1090, Vienna, Austria
| | - Jennifer Shue
- Spine Care Institute, Hospital for Special Surgery, 535 East 70th Street, New York, NY, 10021, USA
| | - Dominik Adl Amini
- Spine Care Institute, Hospital for Special Surgery, 535 East 70th Street, New York, NY, 10021, USA
- Department of Orthopedic Surgery and Traumatology, Charité University Hospital Berlin, Charitéplatz 1, 10117, Berlin, Germany
| | - Manuel Moser
- Spine Care Institute, Hospital for Special Surgery, 535 East 70th Street, New York, NY, 10021, USA
- Department of Spine Surgery, Cantonal Hospital of Lucerne, Spitalstrasse, 6000, Lucerne, Switzerland
| | - Erika Chiapparelli
- Spine Care Institute, Hospital for Special Surgery, 535 East 70th Street, New York, NY, 10021, USA
| | - Andrew A Sama
- Spine Care Institute, Hospital for Special Surgery, 535 East 70th Street, New York, NY, 10021, USA
| | - John A Carrino
- Department of Radiology and Imaging, 535 East 70th Street, New York, NY, 10021, USA
| | - Frank P Cammisa
- Spine Care Institute, Hospital for Special Surgery, 535 East 70th Street, New York, NY, 10021, USA
| | - Federico P Girardi
- Spine Care Institute, Hospital for Special Surgery, 535 East 70th Street, New York, NY, 10021, USA
| | - Alexander P Hughes
- Spine Care Institute, Hospital for Special Surgery, 535 East 70th Street, New York, NY, 10021, USA.
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Zhao G, Song M, Duan W, Chen Z, Xue Y. Biomechanical investigation of intra-articular cage and cantilever technique in the treatment of congenital basilar invagination combined with atlantoaxial dislocation: a finite element analysis. Med Biol Eng Comput 2022; 60:2189-2199. [DOI: 10.1007/s11517-022-02596-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Accepted: 04/11/2022] [Indexed: 10/18/2022]
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7
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Garay RS, Solitro GF, Lam KC, Morris RP, Albarghouthi A, Lindsey RW, Latta LL, Travascio F. Characterization of regional variation of bone mineral density in the geriatric human cervical spine by quantitative computed tomography. PLoS One 2022; 17:e0271187. [PMID: 35802639 PMCID: PMC9269429 DOI: 10.1371/journal.pone.0271187] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2022] [Accepted: 06/24/2022] [Indexed: 11/23/2022] Open
Abstract
Background Odontoid process fractures are among the most common in elderly cervical spines. Their treatment often requires fixation, which may include use of implants anteriorly or posteriorly. Bone density can significantly affect the outcomes of these procedures. Currently, little is known about bone mineral density (BMD) distributions within cervical spine in elderly. This study documented BMD distribution across various anatomical regions of elderly cervical vertebrae. Methods and findings Twenty-three human cadaveric C1-C5 spine segments (14 males and 9 female, 74±9.3 y.o.) were imaged via quantitative CT-scan. Using an established experimental protocol, the three-dimensional shapes of the vertebrae were reconstructed from CT images and partitioned in bone regions (4 regions for C1, 14 regions for C2 and 12 regions for C3-5). The BMD was calculated from the Hounsfield units via calibration phantom. For each vertebral level, effects of gender and anatomical bone region on BMD distribution were investigated via pertinent statistical tools. Data trends suggested that BMD was higher in female vertebrae when compared to male ones. In C1, the highest BMD was found in the posterior portion of the bone. In C2, BMD at the dens was the highest, followed by lamina and spinous process, and the posterior aspect of the vertebral body. In C3-5, lateral masses, lamina, and spinous processes were characterized by the largest values of BMD, followed by the posterior vertebral body. Conclusions The higher BMD values characterizing the posterior aspects of vertebrae suggest that, in the elderly, posterior surgical approaches may offer a better fixation quality.
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Affiliation(s)
- Ryan S. Garay
- Department of Mechanical and Aerospace Engineering, University of Miami, Coral Gables, Florida, United States of America
| | - Giovanni F. Solitro
- Louisiana State University Health-Shreveport, Shreveport, Louisiana, United States of America
| | - Kenrick C. Lam
- University of Texas Medical Branch, Galveston, Texas, United States of America
| | - Randal P. Morris
- University of Texas Medical Branch, Galveston, Texas, United States of America
| | - Abeer Albarghouthi
- Max Biedermann Institute for Biomechanics, Mount Sinai Medical Center, Miami Beach, Florida, United States of America
| | - Ronald W. Lindsey
- University of Texas Medical Branch, Galveston, Texas, United States of America
| | - Loren L. Latta
- Max Biedermann Institute for Biomechanics, Mount Sinai Medical Center, Miami Beach, Florida, United States of America
- Department of Orthopaedic Surgery, University of Miami, Miami, Florida, United States of America
| | - Francesco Travascio
- Department of Mechanical and Aerospace Engineering, University of Miami, Coral Gables, Florida, United States of America
- Max Biedermann Institute for Biomechanics, Mount Sinai Medical Center, Miami Beach, Florida, United States of America
- Department of Orthopaedic Surgery, University of Miami, Miami, Florida, United States of America
- Department of Industrial Engineering, University of Miami, Coral Gables, Florida, United States of America
- * E-mail:
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Lin H, Chen F, Wang Z, Mo J, Lin T, Liu W. Cervical and first thoracic spine Hounsfield Units assessing and its relationship with clinical outcomes and cervical sagittal parameters in patients undergoing anterior cervical spine surgery. World Neurosurg 2022; 164:e169-e176. [DOI: 10.1016/j.wneu.2022.04.065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Revised: 04/15/2022] [Accepted: 04/16/2022] [Indexed: 10/18/2022]
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Salzmann SN, Okano I, Miller CO, Chiapparelli E, Reisener MJ, Amini DA, Winter F, Shue J, Carrino JA, Sama AA, Cammisa FP, Girardi FP, Hughes AP. The cervical spine demonstrates less postoperative bone loss than the lumbar spine. J Orthop Res 2022; 40:654-660. [PMID: 33914982 DOI: 10.1002/jor.25069] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/01/2020] [Revised: 04/21/2021] [Accepted: 04/26/2021] [Indexed: 02/04/2023]
Abstract
The objective of this study is to determine the bone mineral density (BMD) changes in adjacent vertebra following anterior cervical discectomy and fusion (ACDF). Consecutive patients undergoing ACDF with available preoperative and postoperative computed tomography (CT) imaging were included. Quantitative CT measurements of screw-free cervical and first thoracic vertebra were performed. Comparisons between pre- and postoperative BMD in the vertebrae one or two levels above the upper instrumented vertebra (UIV + 1, UIV + 2) and one level below the lowest instrumented vertebra (LIV + 1) were assessed. Seventy-two patients (men, 66.7%) met the inclusion criteria. The patient population was 91.7% Caucasian with a mean age of 55.0 years. The mean interval (±SD) between surgery and secondary CT was 157 ± 23 days. Preoperative BMD (±SD) in UIV + 1 was 300.6 ± 66.2 mg/cm3 . There was a significant BMD loss of 1.5% at UIV + 1 after surgery, resulting in a postoperative BMD of 296.2 ± 64.8 mg/cm3 (p = .029). At UIV + 2 and LIV + 1, no significant differences between pre- and postoperative BMD (304.7 ± 75.7 mg/cm3 vs. 299.8 ± 74.3 mg/cm3 , 197.3 ± 50.4 mg/cm3 vs. 200.8 ± 48.7 mg/cm3 , p = .113 and p = .078, respectively) were observed. Clinical significance Our results demonstrate a small BMD decrease of 1.5% at UIV + 1. This suggests that the effect of ACDF surgery on the adjacent levels might be smaller compared to the previously described lumbar BMD loss of 10%-20% following posterior lumbar fusion procedures.
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Affiliation(s)
- Stephan N Salzmann
- Department of Orthopaedic Surgery, Hospital for Special Surgery, Weill Cornell Medicine, New York, New York, USA
| | - Ichiro Okano
- Department of Orthopaedic Surgery, Hospital for Special Surgery, Weill Cornell Medicine, New York, New York, USA
| | - Courtney Ortiz Miller
- Department of Orthopaedic Surgery, Hospital for Special Surgery, Weill Cornell Medicine, New York, New York, USA
| | - Erika Chiapparelli
- Department of Orthopaedic Surgery, Hospital for Special Surgery, Weill Cornell Medicine, New York, New York, USA
| | - Marie-Jacqueline Reisener
- Department of Orthopaedic Surgery, Hospital for Special Surgery, Weill Cornell Medicine, New York, New York, USA
| | - Dominik Adl Amini
- Department of Orthopaedic Surgery, Hospital for Special Surgery, Weill Cornell Medicine, New York, New York, USA.,Department of Orthopaedic Surgery and Traumatology, Charité University Hospital Berlin Chariteplatz 1, Berlin, Germany
| | - Fabian Winter
- Department of Orthopaedic Surgery, Hospital for Special Surgery, Weill Cornell Medicine, New York, New York, USA
| | - Jennifer Shue
- Department of Orthopaedic Surgery, Hospital for Special Surgery, Weill Cornell Medicine, New York, New York, USA
| | - John A Carrino
- Department of Radiology and Imaging, Hospital for Special Surgery, Weill Cornell Medicine, New York, New York, USA
| | - Andrew A Sama
- Department of Orthopaedic Surgery, Hospital for Special Surgery, Weill Cornell Medicine, New York, New York, USA
| | - Frank P Cammisa
- Department of Orthopaedic Surgery, Hospital for Special Surgery, Weill Cornell Medicine, New York, New York, USA
| | - Federico P Girardi
- Department of Orthopaedic Surgery, Hospital for Special Surgery, Weill Cornell Medicine, New York, New York, USA
| | - Alexander P Hughes
- Department of Orthopaedic Surgery, Hospital for Special Surgery, Weill Cornell Medicine, New York, New York, USA
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Liang X, Liu Q, Xu J, Ding W, Wang H. Hounsfield Unit for Assessing Bone Mineral Density Distribution Within Cervical Vertebrae and Its Correlation With the Intervertebral Disc Degeneration. Front Endocrinol (Lausanne) 2022; 13:920167. [PMID: 35872993 PMCID: PMC9304988 DOI: 10.3389/fendo.2022.920167] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Accepted: 06/07/2022] [Indexed: 12/25/2022] Open
Abstract
STUDY DESIGN Retrospective radiological analysis. OBJECTIVE To assess bone mineral mass distribution within cervical vertebrae based on Hounsfield unit (HU) measurement, and explore its correlation with intervertebral disc degeneration. METHOD Three hundred and twenty-four patients with degenerative cervical spine disease were retrospectively reviewed and divided into six groups according to age. HU measurement of the whole vertebrae from C3 through C7 was obtained, then HU measurement within upper and lower part of the vertebrae on sagittal plane were obtained from C3 through C7. Disc degeneration on MRI was graded from I to V using the Pfirrmann classification. RESULTS There was a significant difference in the HU value from C3 to C7 among Group II to Group VI, the HU value presented consistently decreasing trend from young patients to old patients. In C6 and C7 vertebrae, there were significant differences in HU values between upper and lower parts of the vertebrae. More importantly. In all groups, HU values were highest in the upper part of the C4 vertebrae and then gradually decreased towards C3 and C7. HU value of both upper and lower vertebrae presented decreasing trend along with the aggravation of the disc degeneration. CONCLUSION HU values are not typically consistent throughout all levels of the cervical spine and the distribution within the vertebrae is not homogeneous. Decreased vertebral BMD and vertebral osteoporosis may trigger or exacerbate the adjacent intervertebral disc degeneration.
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Affiliation(s)
- Xiao Liang
- Department of Spinal Surgery, The Third Hospital of Hebei Medical University, Shijiazhuang, China
| | - Qingtao Liu
- Department of Spinal Surgery, The Third Hospital of Hebei Medical University, Shijiazhuang, China
| | - Jiaxin Xu
- Department of Spinal Surgery, The Third Hospital of Hebei Medical University, Shijiazhuang, China
| | - Wenyuan Ding
- Department of Spinal Surgery, The Third Hospital of Hebei Medical University, Shijiazhuang, China
- Hebei Provincial Key Laboratory of Orthopedic Biomechanics, The Third Hospital of Hebei Medical University, Shijiazhuang, China
- *Correspondence: Wenyuan Ding, ; Hui Wang,
| | - Hui Wang
- Department of Spinal Surgery, The Third Hospital of Hebei Medical University, Shijiazhuang, China
- *Correspondence: Wenyuan Ding, ; Hui Wang,
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11
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Lu T, Gao Z, Li J, Liu N, Wang Y, Liu C, He X. Construction of a new cervical anatomically adaptive titanium mesh cage based on measurements of cervical geometry: A morphological and cadaveric study. Exp Ther Med 2021; 22:1256. [PMID: 34603524 PMCID: PMC8453342 DOI: 10.3892/etm.2021.10691] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2019] [Accepted: 07/22/2021] [Indexed: 11/29/2022] Open
Abstract
Mismatch between the titanium mesh cage and cervical geometries is an important factor that induces subsidence in anterior cervical corpectomy and fusion (ACCF). The aim of the present study was to construct a new quadrate anatomically adaptive titanium mesh cage (AA-TMC) that matches well with the cervical geometries and segmental alignment in one- and two-level ACCF. Computed tomography (CT) scans of 54 individuals were used to measure the cervical endplate geometries. X-rays of 74 young individuals were used to measure the intervertebral body angle (IBA) and intervertebral body height (IBH) of the surgical segments. The AA-TMC was designed based on these measured parameters. A total of 18 cervical cadaveric specimens underwent successive one- and two-level ACCF using the AA-TMC. Postoperatively, the specimens underwent CT scanning to assess the degree of matching of the TMC-endplate interface (TEI), IBA and IBH. A TEI interval <0.5 mm was considered well matching. In the sagittal plane, 93.8% of the inferior endplates were arched, whereas 94.8% of the superior endplates were flat. In the coronal plane, 82.9% of the inferior endplates and 93.8% of the superior endplates were flat. A total of 91.7 and 94.4% of the TEIs were well matched in one- and two-level ACCF, respectively. The postoperative IBA and IBH values were consistent with the values of young individuals. The AA-TMC achieved good matching with cervical geometries and segmental alignment in one- and two-level ACCF, and is proposed for use in ACCF to increase the contact at the TEI and achieve sufficient lordosis restoration.
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Affiliation(s)
- Teng Lu
- Department of Orthopedics, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710004, P.R. China
| | - Zhongyang Gao
- Department of Orthopedics, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710004, P.R. China
| | - Jialiang Li
- Department of Orthopedics, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710004, P.R. China
| | - Ning Liu
- Department of Spine Surgery, Hanzhong Central Hospital, Hanzhong, Shaanxi 723000, P.R. China
| | - Yibin Wang
- Department of Orthopedics, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710004, P.R. China
| | - Chao Liu
- Department of Education, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710004, P.R. China
| | - Xijing He
- Department of Orthopedics, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710004, P.R. China
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Lee HJ, You ST, Kim JH, Kim IS, Sung JH, Hong JT. Significance of Cervical Spine Computed Tomography Hounsfield Units to Predict Bone Mineral Density and the Subsidence After Anterior Cervical Discectomy and Fusion. Clin Spine Surg 2021; 34:E450-E457. [PMID: 34091491 DOI: 10.1097/bsd.0000000000001218] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Accepted: 04/07/2021] [Indexed: 11/26/2022]
Abstract
STUDY DESIGN This study was a retrospective review. OBJECTIVE The purpose of this study was to investigate the correlation analysis between Hounsfield units (HU) and dual x-ray absorptiometry (DXA) based on the clinical results of patients who underwent anterior cervical discectomy and fusion (ACDF) surgery. SUMMARY OF BACKGROUND DATA There is no technique to directly measure bone mineral density (BMD) in the cervical spine. As computed tomography is a very popular preoperative planning modality, using the HU value from that analysis to predict osteoporosis is important for patient outcomes and applications in the clinical field. MATERIALS AND METHODS We reviewed the records for 235 patients who underwent 1-level (n=120) or 2-level (n=115) ACDF surgery. In the 1-level ACDF group, the HU was measured from C3 to C6 vertebra, while that for the 2-level ACDF group was measured from 3 surgical index vertebrae. The correlation patterns were analyzed with the corresponding DXA (T-score) for each patient. Subsidence of fusion segment was defined as change in distance between plate-tip and upper (lower) margin of the vertebra (index level) after 4 months of follow-up. In addition, to determine the relevant factors that influence fusion segment subsidence, other preoperative (C2 slope, C7 slope, C2-C7 angle, and C2-C7 sagittal vertical axis) and postoperative parameters (coronal angle and segmental angle change) were measured. RESULTS The correlation coefficient between HU and DXA ranged from 0.57 to 0.71 in the 1-level ACDF group and from 0.59 to 0.66 in the 2-level ACDF group. The correlation between HU and DXA was statistically significant regardless of the degree of anterior osteophyte (r=-0.65 to 0.78). Total subsidence height was 3.8 mm after ACDF, and both HU and DXA were statistically correlated with total subsidence (r=0.26-0.28). In multivariate analysis, HU (middle vertebra) value was statistically associated with the degree of total subsidence. The high-subsidence group (≥4.5 mm) showed smaller HU values (284.1 vs. 316.0) and T-scores (-0.5 vs. 0.1) compared to the low-subsidence group (<4.5 mm). The discrepancy group, defined as cases with excess plate shift on 1 side, also showed smaller HU values (260.4 vs. 312.4) and higher degrees of total subsidence than the matched group. CONCLUSIONS The correlation between HU in cervical computed tomography and lumbar DXA (T-score) was statistically significant in both 1-level and 2-level ACDF. The level of BMD (HU or DXA) is a very important factor for clinically determining the amount and regularity of subsidence after ACDF. Therefore, HU can be a good alternative assessment to accurately reflect as much of the BMD degree as DXA in the cervical spine.
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Affiliation(s)
- Ho Jin Lee
- Department of Neurosurgery, St. Vincent Hospital, College of Medicine, The Catholic University of Korea, Suwon
| | - Soon Tae You
- Department of Neurosurgery, St. Vincent Hospital, College of Medicine, The Catholic University of Korea, Suwon
| | - Jung Hee Kim
- Department of Neurosurgery, Seoul Medical Center
| | - Il Sup Kim
- Department of Neurosurgery, St. Vincent Hospital, College of Medicine, The Catholic University of Korea, Suwon
| | - Jae Hoon Sung
- Department of Neurosurgery, St. Vincent Hospital, College of Medicine, The Catholic University of Korea, Suwon
| | - Jae Taek Hong
- Department of Neurosurgery, Eunpyeong St. Mary's Hospital, College of Medicine, The Catholic University of Korea, College of Medicine, Seoul, Korea
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Wu Y, Loaiza J, Banerji R, Blouin O, Morgan E. Structure-function relationships of the human vertebral endplate. JOR Spine 2021; 4:e1170. [PMID: 34611592 PMCID: PMC8479528 DOI: 10.1002/jsp2.1170] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Revised: 07/30/2021] [Accepted: 08/19/2021] [Indexed: 11/23/2022] Open
Abstract
BACKGROUND Although deformation and fracture of the vertebral endplate have been implicated in spinal conditions such as vertebral fracture and disc degeneration, few biomechanical studies of this structure are available. The goal of this study was to quantify the mechanical behavior of the vertebral endplate. METHODS Eight-five rectangular specimens were dissected from the superior and/or inferior central endplates of human lumbar spine segments L1 to L4. Micro-computed tomography (μCT) imaging, four-point-bend testing, and ashing were performed to quantify the apparent elastic modulus and yield stress (modulus and yield stress, respectively, of the porous vertebral endplate), tissue yield stress (yield stress of the tissue of the vertebral endplate, excluding pores), ultimate strain, fracture strain, bone volume fraction (BV/TV), bone mineral density (BMD), and various measures of tissue density and composition (tissue mineral density, ash fraction, and ash density). Regression was used to assess the dependence of mechanical properties on density and composition. RESULTS Wide variations in elastic and failure properties, and in density and tissue composition, were observed. BMD and BV/TV were good predictors of many of the apparent-level mechanical properties, including modulus, yield stress, and in the case of the inferior vertebral endplate, failure strains. Similar values of the mechanical properties were noted between superior and inferior vertebral endplates. In contrast to the dependence of apparent stiffness and strength on BMD and BV/TV, none of the mechanical properties depended on any of the tissue-level density measurements. CONCLUSION The dependence of many of the mechanical properties of the vertebral endplate on BV/TV and BMD suggests possibilities for noninvasive assessment of how this region of the spine behaves during habitual and injurious loading. Further study of the nonmineral components of the endplate tissue is required to understand how the composition of this tissue may influence the overall mechanical behavior of the vertebral endplate.
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Affiliation(s)
- Yuanqiao Wu
- Department of Mechanical EngineeringBoston UniversityBostonMassachusettsUSA
| | - Johnfredy Loaiza
- Department of Mechanical EngineeringBoston UniversityBostonMassachusettsUSA
| | - Rohin Banerji
- Department of Biomedical EngineeringBoston UniversityBostonMassachusettsUSA
| | - Olivia Blouin
- Department of Biomedical EngineeringBoston UniversityBostonMassachusettsUSA
| | - Elise Morgan
- Department of Mechanical EngineeringBoston UniversityBostonMassachusettsUSA
- Department of Biomedical EngineeringBoston UniversityBostonMassachusettsUSA
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Hara T, Ohara Y, Abe E, Takami K, Orías AAE, Arai H, Inoue N. Cervical endplate bone density distribution measured by CT osteoabsorptiometry and direct comparison with mechanical properties of the endplate. 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 2021; 30:2557-2564. [PMID: 34268667 DOI: 10.1007/s00586-021-06920-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Revised: 06/26/2021] [Accepted: 07/05/2021] [Indexed: 11/29/2022]
Abstract
PURPOSE Intervertebral device subsidence is one of the complications of anterior cervical discectomy and fusion. The biomechanical properties of vertebral bony endplate may be related to device subsidence. The aim of this study is to measure the cervical endplate bone density distribution using a novel 3D measurement method. METHODS Eight human cadaver cervical spines were obtained and levels C3-C7 were dissected and CT scanned. Three-dimensional (3D) CT model was created with the same 3D coordinates of the original DICOM dataset. The regional strength and stiffness of the endplate were determined by indentation testing. The indentation points were recorded by a photograph and the location of the indentation points was projected to the 3D CT model. Three-dimensional coordinates of the indentation point was obtained in the 3D space determined by the DICOM dataset. The area underneath the indentation point was calculated by a trilinear interpolation method directly. Data in HU and correlations with the indentation strength and stiffness were analysed. RESULTS A positive correlation was found between HU and strength (r = 0.52) and between HU and stiffness (r = 0.41). Overall, mechanical strength and stiffness and HU in the superior endplate of the caudal vertebra were lower than those in the inferior endplate of the cranial vertebra in the same intervertebral disc. CONCLUSIONS The mechanical properties and the HU were found to be significantly correlated, which employed a novel 3D HU measurement method, thus demonstrating potential to predict cervical endplate failure risk in a clinical setting.
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Affiliation(s)
- Takeshi Hara
- Department of Neurosurgery, Juntendo University School of Medicine, Tokyo, Japan.
| | - Yukoh Ohara
- Department of Neurosurgery, Juntendo University School of Medicine, Tokyo, Japan
| | - Eiji Abe
- Department of Neurosurgery, Juntendo University School of Medicine, Tokyo, Japan
| | - Kaosu Takami
- Department of Orthopedic Surgery, Rush University Medical Center, Chicago, USA
| | | | - Hajime Arai
- Department of Neurosurgery, Juntendo University School of Medicine, Tokyo, Japan
| | - Nozomu Inoue
- Department of Orthopedic Surgery, Rush University Medical Center, Chicago, USA
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Salzmann SN, Okano I, Ortiz Miller C, Chiapparelli E, Reisener MJ, Winter F, Shue J, Carrino JA, Sama AA, Cammisa FP, Girardi FP, Hughes AP. Regional bone mineral density differences measured by quantitative computed tomography in patients undergoing anterior cervical spine surgery. Spine J 2020; 20:1056-1064. [PMID: 32087388 DOI: 10.1016/j.spinee.2020.02.011] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/22/2019] [Revised: 02/12/2020] [Accepted: 02/12/2020] [Indexed: 02/03/2023]
Abstract
BACKGROUND CONTEXT Clinically, the association between bone mineral density (BMD) and surgical instrumentation efficacy is well recognized. Although several studies have quantified the BMD of the human lumbar spine, comprehensive BMD data for the cervical spine is limited. The few available studies included young and healthy patient samples, which may not represent the typical cervical fusion patient. Currently no large scale study provides detailed BMD information of the cervical and first thoracic vertebrae in patients undergoing anterior cervical spine surgery. PURPOSE The objective of this study was to determine possible trabecular BMD variations throughout the cervical spine and first thoracic vertebra in patients undergoing anterior cervical discectomy and fusion (ACDF) and to assess the correlation between BMDs of the spinal levels C1-T1. STUDY DESIGN/SETTING This is a retrospective case series. PATIENT SAMPLE Patients undergoing ACDF from 2015 to 2018 at a single, academic institution with available preoperative CT imaging were included in this study. OUTCOME MEASURES The outcome measure was BMD measured by QCT. METHODS Patients that underwent ACDF from 2015 to 2018 at a single, academic institution were included in this study. Subjects with previous cervical instrumentation or missing/incomplete preoperative cervical spine CT imaging were excluded. Asynchronous quantitative computed tomography (QCT) measurements of the lateral masses of C1 and the C2-T1 vertebral bodies were performed. For this purpose, an elliptical region of interest that consisted exclusively of trabecular bone was selected. Any apparent sclerotic levels that might affect trabecular QCT measurements were excluded from the final analysis. Interobserver reliability of measurements was assessed by calculating the interclass correlation coefficients (ICC). Pairwise comparison of BMD was performed and correlations between the various cervical levels were evaluated. The statistical significance level was set at p<.05. RESULTS In all, 194 patients (men, 62.9%) met inclusion criteria. The patient population was 91.2% Caucasian with a mean age of 55.9 years and mean BMI of 28.2 kg/m2. The ICC of cervical QCT measurements was excellent (ICC 0.92). The trabecular BMD was highest in the mid-cervical spine (C4) and decreased in the caudal direction (C1 average=253.3 mg/cm3, C2=276.6 mg/cm3, C3=272.2 mg/cm3, C4=283.5 mg/cm3, C5=265.1 mg/cm3, C6=235.3 mg/cm3, C7=216.8 mg/cm3, T1=184.4 mg/cm3). The BMD of C7 and T1 was significantly lower than those of all other levels. Nonetheless, significant correlations in BMD among all measured levels were observed, with a Pearson's correlation coefficient ranging from 0.507 to 0.885. CONCLUSIONS To the authors' knowledge this is the largest study assessing trabecular BMD of the entire cervical spine and first thoracic vertebra by QCT. The patient sample consisted of patients undergoing ACDF, which adds to the clinical relevance of the findings. Knowledge of BMD variation in the cervical spine might be useful to surgeons utilizing anterior cervical spine plate and screw systems. Due to the significant variation in cervical BMD, procedures involving instrumentation at lower density caudal levels might potentially benefit from a modification in instrumentation or surgical technique to achieve results similar to more cephalad levels.
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Affiliation(s)
- Stephan N Salzmann
- Spine Care Institute, Hospital for Special Surgery, Weill Cornell Medicine, 535 East 70th St, New York, NY 10021, USA
| | - Ichiro Okano
- Spine Care Institute, Hospital for Special Surgery, Weill Cornell Medicine, 535 East 70th St, New York, NY 10021, USA
| | - Courtney Ortiz Miller
- Spine Care Institute, Hospital for Special Surgery, Weill Cornell Medicine, 535 East 70th St, New York, NY 10021, USA
| | - Erika Chiapparelli
- Spine Care Institute, Hospital for Special Surgery, Weill Cornell Medicine, 535 East 70th St, New York, NY 10021, USA
| | - Marie-Jacqueline Reisener
- Spine Care Institute, Hospital for Special Surgery, Weill Cornell Medicine, 535 East 70th St, New York, NY 10021, USA
| | - Fabian Winter
- Spine Care Institute, Hospital for Special Surgery, Weill Cornell Medicine, 535 East 70th St, New York, NY 10021, USA
| | - Jennifer Shue
- Spine Care Institute, Hospital for Special Surgery, Weill Cornell Medicine, 535 East 70th St, New York, NY 10021, USA
| | - John A Carrino
- Spine Care Institute, Hospital for Special Surgery, Weill Cornell Medicine, 535 East 70th St, New York, NY 10021, USA
| | - Andrew A Sama
- Spine Care Institute, Hospital for Special Surgery, Weill Cornell Medicine, 535 East 70th St, New York, NY 10021, USA
| | - Frank P Cammisa
- Spine Care Institute, Hospital for Special Surgery, Weill Cornell Medicine, 535 East 70th St, New York, NY 10021, USA
| | - Federico P Girardi
- Spine Care Institute, Hospital for Special Surgery, Weill Cornell Medicine, 535 East 70th St, New York, NY 10021, USA
| | - Alexander P Hughes
- Spine Care Institute, Hospital for Special Surgery, Weill Cornell Medicine, 535 East 70th St, New York, NY 10021, USA.
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McKay M, Jackman TM, Hussein AI, Guermazi A, Liu J, Morgan EF. Association of vertebral endplate microstructure with bone strength in men and women. Bone 2020; 131:115147. [PMID: 31706053 PMCID: PMC6930346 DOI: 10.1016/j.bone.2019.115147] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/27/2019] [Revised: 10/23/2019] [Accepted: 11/05/2019] [Indexed: 11/26/2022]
Abstract
Epidemiological and biomechanical evidence indicates that the risk of vertebral fracture differs between men and women, and that vertebral fracture frequently involves failure of the endplate region. The goal of this study was to compare the bone microstructure of the endplate region-defined as the (bony) vertebral endplate and underlying subchondral trabecular bone-between sexes and to determine whether any such sex differences are associated with vertebral strength. The bone density (volume fraction, apparent density and tissue mineral density) of the superior-most 2 mm of the vertebra, and the bone density and trabecular architecture of the next 5 mm were quantified using micro-computed tomography in human T8 (12 female, 16 male) and L1 (13 female, 12 male) vertebrae. Average density of the vertebra (integral bone mineral density (BMD)) was determined by quantitative computed tomography and compressive strength by mechanical testing. Few differences were found between male and female vertebrae in the density of the endplate region; none were found in trabecular architecture. However, whereas endplate volume fraction was positively correlated with integral BMD in male vertebrae (r = 0.654, p < .001), no correlation was found in the female vertebrae (r = 0.157, p = .455). Accounting for the density of the endplate region improved predictions of vertebral strength (p < .034) and eliminated sex-specificity in the strength prediction that was based on integral BMD alone. These results suggest that the density of the endplate region influences vertebral fracture and that non-invasive assessment of this region's density can contribute to predictions of vertebral strength in men and women.
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Affiliation(s)
- MeiLissa McKay
- Department of Mechanical Engineering, 110 Cummington Mall, Boston University, Boston, MA 02215, USA
| | - Timothy M Jackman
- Department of Mechanical Engineering, 110 Cummington Mall, Boston University, Boston, MA 02215, USA
| | - Amira I Hussein
- Department of Mechanical Engineering, 110 Cummington Mall, Boston University, Boston, MA 02215, USA
| | - Ali Guermazi
- Department of Radiology, Boston University School of Medicine, 820 Harrison Avenue, FGH Building, 3rd Floor, Boston, MA 02118, USA
| | - Jingjiang Liu
- Department of Mechanical Engineering, 110 Cummington Mall, Boston University, Boston, MA 02215, USA
| | - Elise F Morgan
- Department of Mechanical Engineering, 110 Cummington Mall, Boston University, Boston, MA 02215, USA.
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17
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Liu N, Lu T, Wang Y, Sun Z, Li J, He X. Effects of New Cage Profiles on the Improvement in Biomechanical Performance of Multilevel Anterior Cervical Corpectomy and Fusion: A Finite Element Analysis. World Neurosurg 2019; 129:e87-e96. [DOI: 10.1016/j.wneu.2019.05.037] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Revised: 05/03/2019] [Accepted: 05/04/2019] [Indexed: 02/07/2023]
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18
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Lu T, Lu Y. Comparison of Biomechanical Performance Among Posterolateral Fusion and Transforaminal, Extreme, and Oblique Lumbar Interbody Fusion: A Finite Element Analysis. World Neurosurg 2019; 129:e890-e899. [DOI: 10.1016/j.wneu.2019.06.074] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2019] [Revised: 06/08/2019] [Accepted: 06/10/2019] [Indexed: 12/26/2022]
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Lu T, Gao Z, He X, Li J, Liu N, Liang H, Wang Y, Wen Z, Zhang T, Wang D, Li H. [Effects of a new anatomical adaptive titanium mesh cage on supportive load at the cervical endplate: a morphological and biomechanical study]. NAN FANG YI KE DA XUE XUE BAO = JOURNAL OF SOUTHERN MEDICAL UNIVERSITY 2019; 39:409-414. [PMID: 31068283 DOI: 10.12122/j.issn.1673-4254.2019.04.05] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
OBJECTIVE To assess the geometrical matching of a new anatomical adaptive titanium mesh cage (AA-TMC) with the endplate and its effect on cervical segmental alignment reconstruction in single- and two-level anterior cervical corpectomy and fusion (ACCF) and compare the compressive load at the endplate between the AA-TMC and the conventional titanium mesh cage (TMC). METHODS Twelve cervical cadaveric specimens were used to perform single- and two-level ACCF. The interbody angle (IBA), interbody height (IBH) and the interval between the AA-TMC and the endplate were evaluated by comparison of the pre- and postoperative X-ray images. The maximum load at the endplate was compared between the AA-TMC and TMC based on American Society for Testing and Materials (ASTM) F2267 standard. RESULTS No significant differences were found between the preoperative and postoperative IBA and IBH in either single-level ACCF (11.62°±2.67° vs 12.13°±0.69° and 23.90±2.18 mm vs 24.23±1.13 mm, respectively; P > 0.05) or two-level ACCF (15.63°±5.06° vs 16.16°±1.05°and 42.93±3.51 mm vs 43.04±1.70 mm, respectively; P > 0.05). The mean interval between the AA-TMC and the endplate was 0.37 ± 0.3 mm. Compared to the conventional TMC, the use of AA-TMC significantly increased the maximum load at the endplate in both single-level ACCF (719.7±5.5 N vs 875.8±5.2 N, P < 0.05) and two-level ACCF (634.3±5.9 N vs 873±6.1 N, P < 0.05). CONCLUSIONS The use of AA-TMC in single-level and two-level ACCF can significantly increase the maximum load at the endplate to lower the possibility of implant subsidence and allows effective reconstruction of the cervical alignment.
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Affiliation(s)
- Teng Lu
- Department of Orthopedics, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710004, China
| | - Zhongyang Gao
- Department of Orthopedics, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710004, China
| | - Xijing He
- Department of Orthopedics, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710004, China
| | - Jialiang Li
- Department of Orthopedics, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710004, China
| | - Ning Liu
- Department of Spine Surgery, Hanzhong Central Hospital, Hanzhong 723000, China
| | - Hui Liang
- Department of Orthopedics, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710004, China
| | - Yibin Wang
- Department of Orthopedics, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710004, China
| | - Zhijing Wen
- Department of Orthopedics, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710004, China
| | - Ting Zhang
- Department of Orthopedics, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710004, China
| | - Dong Wang
- Department of Orthopedics, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710004, China
| | - Haopeng Li
- Department of Orthopedics, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710004, China
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20
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Wen Z, Lu T, Wang Y, Liang H, Gao Z, He X. Anterior Cervical Corpectomy and Fusion and Anterior Cervical Discectomy and Fusion Using Titanium Mesh Cages for Treatment of Degenerative Cervical Pathologies: A Literature Review. Med Sci Monit 2018; 24:6398-6404. [PMID: 30208015 PMCID: PMC6147051 DOI: 10.12659/msm.910269] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Anterior cervical corpectomy and fusion (ACCF) and anterior cervical discectomy and fusion (ACDF) are 2 effective and safe surgical treatments of degenerative cervical pathologies and are associated with a high percentage of excellent clinical outcomes when a graft or device must be used during the surgery, such as an allograft, autograft, nano-hydroxyapatite/polyamide cages, poly-ether-ether-ketone (PEEK) cages, and titanium mesh cages (TMCs). Although TMCs have been used in cervical surgeries for almost 2 decades, no specific reviews have been performed introducing the state of this material. Thus, in the present review, we discuss the status of using TMCs in anterior cervical surgeries. Studies that tested the usage of TMCs in treating degenerative cervical pathologies were included in this review. The development and progress of TMCs, the biomechanical analysis of TMCs, the radiological and clinical assessment of TMCs, the advantages and disadvantages of using TMCs, and their prospects for future applications as a device of ACCF and ACDF in treating degenerative cervical pathologies are discussed. Studies included in this review showed that TMCs can provide sufficient biomechanical stability. Furthermore, the TMCs used in anterior cervical fusion avoid the donor-site morbidity and achieve a solid bony fusion. However, there are some shortcomings. The structural characteristics and the design of TMCs cause the TMC subsidence rate to remain high, thus resulting in multiple related complications. We believe that due to the virtues of TMCs, they are worthy of application and promotion. However, the structure of TMCs should be further optimized to reduce the TMC subsidence rate and subsidence-related complications, ultimately achieving excellent clinical results.
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Affiliation(s)
- Zhijing Wen
- Department of Orthopedics, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, China (mainland)
| | - Teng Lu
- Department of Orthopedics, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, China (mainland)
| | - Yibin Wang
- Department of Orthopedics, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, China (mainland)
| | - Hui Liang
- Department of Orthopaedics, Second Affiliated Hospital of Xi'an Jiaotong University, Shanxi xi'an, China (mainland)
| | - Zhengchao Gao
- Department of Orthopedics, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, China (mainland)
| | - Xijing He
- Department of Orthopedics, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, China (mainland)
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Yao Q, Yin P, Khan K, Tsai TY, Li JS, Hai Y, Tang P, Li G. Differences of the Morphology of Subaxial Cervical Spine Endplates between Chinese and White Men and Women. BIOMED RESEARCH INTERNATIONAL 2018; 2018:2854175. [PMID: 29675423 PMCID: PMC5838464 DOI: 10.1155/2018/2854175] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/09/2017] [Accepted: 01/22/2018] [Indexed: 01/15/2023]
Abstract
Objective. The aim of this comparative anatomical study was to specifically investigate endplate morphology differences between Chinese and White men and women. Materials and Methods. Three-dimensional cervical endplate models were constructed using computed tomography imaging of 41 healthy Chinese and 24 White subjects. The morphologic measurements of cervical endplate included linear parameters (EPWu: upper endplate width; EPDu: upper endplate depth; EPWl: lower endplate width; and EPDl: lower endplate depth) and area parameters with a digital measuring system. Results. All linear parameters showed a constant increase from C3 to C7 except for EPDl in both the Chinese and the White subjects. An increase trend was observed on area parameters in both Chinese and White subjects. The ratio of EPWl/EPDl was smaller in Chinese females than in White females at C3, C4, and C6 levels (P < 0.05). The ratio of EPWl/EPDl was significantly different between the Chinese and White men at C4-5 levels (P < 0.05). Conclusions. Our data indicates that the morphology of subaxial cervical spine endplates between Chinese and White men and women is different in most of the linear and area parameters. This information could provide guidelines for the design of CDA implants and the improvement of surgical techniques.
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Affiliation(s)
- Qi Yao
- Department of Orthopedics, Chinese PLA General Hospital, No. 28 Fuxin Road, Beijing 100853, China
- Department of Orthopedics, Beijing Shijitan Hospital, Capital Medical University, Beijing 100037, China
| | - Peng Yin
- Department of Orthopedics, Beijing Chaoyang Hospital, Capital Medical University, Beijing 100020, China
| | - Kamran Khan
- Bioengineering Laboratory, Department of Orthopedic Surgery, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
| | - Tsung-Yuan Tsai
- Bioengineering Laboratory, Department of Orthopedic Surgery, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
| | - Jing-Sheng Li
- Bioengineering Laboratory, Department of Orthopedic Surgery, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
| | - Yong Hai
- Department of Orthopedics, Beijing Chaoyang Hospital, Capital Medical University, Beijing 100020, China
| | - Peifu Tang
- Department of Orthopedics, Chinese PLA General Hospital, No. 28 Fuxin Road, Beijing 100853, China
| | - Guoan Li
- Bioengineering Laboratory, Department of Orthopedic Surgery, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
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Vertebral Body Hounsfield Units are Associated With Cage Subsidence After Transforaminal Lumbar Interbody Fusion With Unilateral Pedicle Screw Fixation. Clin Spine Surg 2017; 30:E1130-E1136. [PMID: 27906743 DOI: 10.1097/bsd.0000000000000490] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVE To assess the association between Hounsfield units (HU) measurement and cage subsidence after lumbar interbody fusion. BACKGROUND Transforaminal lumbar interbody fusion (TLIF) with unilateral fixation becomes a popular treatment modality for lumbar degenerative disease. Cage subsidence is a potentially devastating complication after lumbar interbody fusion with unilateral fixation. Recently, a new technique for assessing bone mineral density using HU values from computed tomography has been proposed. Bone quality is believed to be one of the important factors that cause cage subsidence after TLIF. MATERIALS AND METHODS Cage subsidence after single-level (L4/5) TLIF with unilateral fixation was prospectively documented at a single institution between 2013 and 2014. Patients with cage subsidence were matched 1:1 to a control cohort without cage subsidence on the basis of age and sex. HU values were measured from the preoperative computed tomography. All patients received computed tomographic scans at a minimum of 6 months postoperatively. Sagittal images were evaluated for evidence of cage subsidence. RESULTS Eighteen patients with cage subsidence were well matched 1:1 to a cohort without cage subsidence and had complete imaging data. The global lumbar HU values were significantly lower in patients with cage subsidence than in the controls (112.4±10.08 vs. 140.2±10.17; P=0.0015). Similarly, a regional assessment of HU across the fusion levels was significantly lower in patients with cage subsidence (113.4±10.47 vs. 127.9±8.13; P=0.0075). The areas under the receiver operating characteristic cure were 0.715 and 0.636 for global and regional assessment, respectively. The best cut-offs for global and regional assessment were 132 (sensitivity: 83.3%; specificity: 61.1%) and 122 (sensitivity: 72.2%; specificity: 55.6%), respectively. CONCLUSIONS Lower preoperative HU values is associated with cage subsidence after TLIF with unilateral fixation. HU measurement may be used as a predictor of cage subsidence after unilateral fixation, which also should be incorporated in preoperative planning.
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Lu T, Liang H, Liu C, Guo S, Zhang T, Yang B, He X. Effects of Titanium Mesh Cage End Structures on the Compressive Load at the Endplate Interface: A Cadaveric Biomechanical Study. Med Sci Monit 2017; 23:2863-2870. [PMID: 28604653 PMCID: PMC5478219 DOI: 10.12659/msm.905466] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Background This study aimed to evaluate whether obliquely angled and ring-shaped titanium mesh cage (TMC) end structures can improve the compressive load on the endplate interface in anterior cervical corpectomy and fusion (ACCF). Material/Methods A total of 23 volunteers underwent cervical lateral x-ray. The oblique angle of the superior endplate was measured, which was used to construct the gradient of the TMC end. Forty-two fresh cadaveric vertebral bodies were harvested and randomly distributed among four TMC groups with different ends. The baseline indicators of bone mineral density and anteroposterior and transverse dimensions were recorded. The superior endplate was placed at an angle of 12° when performing uniaxial compression testing. The maximum loads of the four TMCs were assessed. Results There were no significant differences among the groups regarding the baseline indicators. The conventional TMC had the lowest maximum load (1362.3±221.78 N, p<0.05), whereas the TMC with an obliquely end ring had the highest maximum load (2095.82±285.64 N, p<0.05). The maximum loads of the TMCs with oblique footprints and flat end ring were much higher than that of the conventional TMC (p<0.05) but significantly lower than that of the TMC with the obliquely end ring (p<0.05), with average values of 1806.91±246.98 N and 1725.3±213.33 N, respectively. Conclusions Both the ring shape and oblique angle of the TMC end contributed to an increase in compressive force and are advocated for use in TMC structure optimization to decrease the incidence of TMC subsidence in ACCF.
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Affiliation(s)
- Teng Lu
- Department of Orthopedics, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, China (mainland)
| | - Hui Liang
- Department of Orthopedics, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, China (mainland)
| | - Chao Liu
- Department of Education, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, China (mainland)
| | - Shuai Guo
- Department of Orthopedics, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, China (mainland)
| | - Ting Zhang
- Department of Orthopedics, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, China (mainland)
| | - Baohui Yang
- Department of Orthopedics, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, China (mainland)
| | - Xijing He
- Department of Orthopaedics, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, China (mainland)
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24
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Cervical spine bone density in young healthy adults as a function of sex, vertebral level and anatomic location. 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 2017; 26:2281-2289. [PMID: 28478522 DOI: 10.1007/s00586-017-5119-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2016] [Revised: 02/21/2017] [Accepted: 05/01/2017] [Indexed: 12/16/2022]
Abstract
PURPOSE Bone mineral density (BMD) measured using quantitative computed tomography (QCT) has been shown to correlate with bone mechanical properties. Knowledge of BMD within specific anatomic regions of the spine is valuable to surgeons who must secure instrumentation to the vertebrae, to medical device developers who design screws and disc replacements, and to researchers who assign mechanical properties to computational models. The objective of this study was to comprehensively characterize BMD in the cervical spine of young healthy adults. METHODS QCT was used to determine BMD in the cervical spines of 31 healthy adults (age 20-35). Subject-specific 3D models of each vertebra were created from CT scans, and anatomic regions of interest were identified in each bone (C1: 3 regions; C2: 9 regions, C3-C7: 13 regions). Statistical tests were performed to identify differences in BMD according to vertebral level, anatomic regions within vertebrae, and sex. RESULTS BMD varied significantly among vertebral levels and among anatomic regions within each vertebra. Females had higher BMD than males (p = .041) primarily due to higher BMD in the posterior regions of each vertebra. CONCLUSIONS These data can serve as a baseline to identify BMD changes in older and symptomatic patients. This data set is also the first report of volumetric bone density within different anatomic regions of the atlas and axis of the cervical spine. The finding of higher BMD in females is in agreement with the previous QCT results but contradicts DEXA results that are known to be dependent upon bone size.
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25
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Pinder EM, Sharp DJ. Cage subsidence after anterior cervical discectomy and fusion using a cage alone or combined with anterior plate fixation. J Orthop Surg (Hong Kong) 2016; 24:97-100. [PMID: 27122522 DOI: 10.1177/230949901602400122] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
PURPOSE To compare the extent of cage subsidence after anterior cervical discectomy and fusion (ACDF) using a cage alone or combined with anterior plate fixation, and to assess the effect of end plate removal on cage subsidence. METHODS Records of 23 men and 13 women aged 32 to 82 (mean, 54) years who underwent ACDF for 61 levels using the Solis cage alone (n=46) or combined with anterior plate fixation (n=15) were reviewed. The extent of cage subsidence was determined by comparing immediately postoperative (within one week) with final follow-up radiographs. Cage subsidence was defined as the sum subsidence of the superior and inferior part of the cage into the vertebral body. Mild and major cage subsidence was defined as ≤2 mm and >2 mm, respectively. RESULTS Patients who underwent ACDF using a cage alone or combined with anterior plate fixation were comparable in terms of age, gender, follow-up duration, and number of levels decompressed. Cage subsidence occurred in 33 (54%) of the 61 levels decompressed. In the cage alone group, the extent of cage subsidence was greater (1.68 vs. 0.57 mm, p=0.039) and the rate of major cage subsidence was higher (28% vs. 7%, p=0.08). The inferior part of the cage was more vulnerable to subsidence compared with the superior part (median subsidence: 3.0 vs. 1.4 mm, p<0.0001). Cage subsidence occurred more often when the end plate was removed rather than preserved (58% vs. 18%, p<0.002). CONCLUSION The extent of cage subsidence was greater after ACDF with cage alone. Cage subsidence occurred more often when the end plate was removed. Additional anterior plate fixation is recommended when the end plate is removed.
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Affiliation(s)
- E M Pinder
- Ipswich Hospital NHS Trust, Ipswich, Suffolk, United Kingdom
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26
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Zhang BC, Liu HB, Cai XH, Wang ZH, Xu F, Kang H, Ding R, Luo XQ. Biomechanical comparison of a novel transoral atlantoaxial anchored cage with established fixation technique - a finite element analysis. BMC Musculoskelet Disord 2015; 16:261. [PMID: 26395763 PMCID: PMC4579577 DOI: 10.1186/s12891-015-0662-7] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/15/2015] [Accepted: 08/06/2015] [Indexed: 12/16/2022] Open
Abstract
BACKGROUND The transoral atlantoaxial reduction plate (TARP) fixation has been introduced to achieve reduction, decompression, fixation and fusion of C1-C2 through a transoral-only approach. However, it may also be associated with potential disadvantages, including dysphagia and load shielding of the bone graft. To prevent potential disadvantages related to TARP fixation, a novel transoral atlantoaxial fusion cage with integrated plate (Cage + Plate) device for stabilization of the C1-C2 segment is designed. The aims of the present study were to compare the biomechanical differences between Cage + Plate device and Cage + TARP device for the treatment of basilar invagination (BI) with irreducible atlantoaxial dislocation (IAAD). METHODS A detailed, nonlinear finite element model (FEM) of the intact upper cervical spine had been developed and validated. Then a FEM of an unstable BI model treated with Cage + Plate fixation, was compared to that with Cage + TARP fixation. All models were subjected to vertical load with pure moments in flexion, extension, lateral bending and axial rotation. Range of motion (ROM) of C1-C2 segment and maximum von Mises Stress of the C2 endplate and bone graft were quantified for the two devices. RESULTS Both devices significantly reduced ROM compared with the intact state. In comparison with the Cage + Plate model, the Cage + TARP model reduced the ROM by 82.5 %, 46.2 %, 10.0 % and 74.3 % in flexion, extension, lateral bending, and axial rotation. The Cage + Plate model showed a higher increase stresses on C2 endplate and bone graft than the Cage + TARP model in all motions. CONCLUSIONS Our results indicate that the novel Cage + Plate device may provide lower biomechanical stability than the Cage + TARP device in flexion, extension, and axial rotation, however, it may reduce stress shielding of the bone graft for successful fusion and minimize the risk of postoperative dysphagia. Clinical trials are now required to validate the reproducibility and advantages of our findings using this anchored cage for the treatment of BI with IAAD.
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Affiliation(s)
- Bao-cheng Zhang
- Department of Orthopaedics, Wuhan General Hospital of Guangzhou Command of PLA, Wuhan 430070, China. .,Southern Medical University, Guangzhou 510515, China.
| | - Hai-bo Liu
- Institute of Applied Mechanics and Biomedical Engineering, Taiyuan University of Technology, Taiyuan 030024, China.
| | - Xian-hua Cai
- Department of Orthopaedics, Wuhan General Hospital of Guangzhou Command of PLA, Wuhan 430070, China. .,Southern Medical University, Guangzhou 510515, China.
| | - Zhi-hua Wang
- Institute of Applied Mechanics and Biomedical Engineering, Taiyuan University of Technology, Taiyuan 030024, China.
| | - Feng Xu
- Department of Orthopaedics, Wuhan General Hospital of Guangzhou Command of PLA, Wuhan 430070, China.
| | - Hui Kang
- Department of Orthopaedics, Wuhan General Hospital of Guangzhou Command of PLA, Wuhan 430070, China.
| | - Ran Ding
- Department of Orthopaedics, Wuhan General Hospital of Guangzhou Command of PLA, Wuhan 430070, China.
| | - Xiao-qing Luo
- The School of Internet of Things, Jiangnan University, Wuxi 214122, China.
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Brenke C, Dostal M, Scharf J, Weiß C, Schmieder K, Barth M. Influence of cervical bone mineral density on cage subsidence in patients following stand-alone anterior cervical discectomy and fusion. 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 2014; 24:2832-40. [PMID: 25524227 DOI: 10.1007/s00586-014-3725-9] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2014] [Revised: 12/12/2014] [Accepted: 12/13/2014] [Indexed: 10/24/2022]
Abstract
PURPOSE Anterior cervical discectomy and fusion (ACDF) is a common procedure for the treatment of cervical degenerative diseases. However, cage subsidence remains a frequent problem. We therefore investigated if cage design and site-specific bone mineral density (BMD) contribute to the rate and direction of subsidence following ACDF. METHODS Patients were prospectively included and received two different cages (groups 1 and 2) using minimization randomization. The degree and direction of cage subsidence were determined using plain radiographs. Neck pain intensity on the visual analogue scale (VAS), the neck disability index (NDI), and the patient satisfaction index were recorded up to 12 months after surgery. RESULTS 88 patients were analysed with a mean age of 53.7 ± 11.8 years. BMD values decreased in craniocaudal direction from 302.0 ± 62.2 to 235.5 ± 38.9 mg/cm(3). Both groups showed significant height gain after the operation (both p < 0.001), followed by height loss at 3 months (both p < 0.05) and at 3-12 months after the operation (both p > 0.05). Both groups showed improvement of VAS neck pain intensity (both p < 0.05) and NDI (both p < 0.05). The direction of cage subsidence was similar, no correlations were found between cage subsidence and BMD or various clinical parameters. CONCLUSIONS Implant geometry of both cages and variations of the operative procedure promoted a relatively high degree of cage subsidence. Further studies are necessary to identify a relation of BMD and subsidence using optimized implant geometry and by controlling additional intraoperative variables.
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Affiliation(s)
- Christopher Brenke
- Department of Neurosurgery, Knappschaftskrankenhaus Bochum, Ruhr-University Bochum, In der Schornau 23-25, 44892, Bochum, Germany.
| | - Martin Dostal
- Department of Neurosurgery, University Medicine Mannheim, Medical Faculty Mannheim of the University of Heidelberg, Heidelberg, Germany
| | - Johann Scharf
- Department of Neuroradiology, University Medicine Mannheim, Medical Faculty Mannheim of the University of Heidelberg, Heidelberg, Germany
| | - Christel Weiß
- Department of Medical Statistics, University Medicine Mannheim, Medical Faculty Mannheim of the University of Heidelberg, Heidelberg, Germany
| | - Kirsten Schmieder
- Department of Neurosurgery, Knappschaftskrankenhaus Bochum, Ruhr-University Bochum, In der Schornau 23-25, 44892, Bochum, Germany
| | - Martin Barth
- Department of Neurosurgery, Knappschaftskrankenhaus Bochum, Ruhr-University Bochum, In der Schornau 23-25, 44892, Bochum, Germany
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Ordway NR, Rim BC, Tan R, Hickman R, Fayyazi AH. Anterior cervical interbody constructs: effect of a repetitive compressive force on the endplate. J Orthop Res 2012; 30:587-92. [PMID: 22002745 DOI: 10.1002/jor.21566] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/20/2011] [Accepted: 09/19/2011] [Indexed: 02/04/2023]
Abstract
Graft subsidence following anterior cervical reconstruction can result in the loss of sagittal balance and recurring foraminal stenosis. This study examined the implant-endplate interface using a cyclic fatigue loading protocol in an attempt to model the subsidence seen in vivo. The superior endplate from 30 cervical vertebrae (C3 to T1) were harvested and biomechanically tested in axial compression with one of three implants: Fibular allograft; titanium mesh cage packed with cancellous chips; and trabecular metal. Each construct was cyclically loaded from 50 to 250 N for 10,000 cycles. Nondestructive cyclic loading of the cervical endplate-implant construct resulted in a stiffer construct independent of the type of the interbody implant tested. The trabecular metal construct demonstrated significantly more axial stability and significantly less subsidence in comparison to the titanium mesh construct. Although the allograft construct resulted in more subsidence than the trabecular metal construct, the difference was not significant and no difference was found when comparing axial stability. For all constructs, the majority of the subsidence during the cyclic testing occurred during the first 500 cycles and was followed by a more gradual settling in the remaining 9,500 cycles.
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Affiliation(s)
- Nathaniel R Ordway
- Department of Orthopedic Surgery, SUNY Upstate Medical University, 750 East Adams Streets, Syracuse, 13201 New York, USA.
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Cervical spine bone mineral density as a function of vertebral level and anatomic location. Spine J 2011; 11:659-67. [PMID: 21689990 PMCID: PMC3152633 DOI: 10.1016/j.spinee.2011.05.007] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/12/2010] [Revised: 03/23/2011] [Accepted: 05/16/2011] [Indexed: 02/03/2023]
Abstract
BACKGROUND CONTEXT Bone mineral density (BMD) measurements acquired from quantitative computed tomography scans have been shown to correlate with bone mechanical properties such as strength, stiffness, and yield load. There are currently no reports of BMD as a function of anatomic location within each vertebra. PURPOSE The overall objective of this study was to characterize BMD in the cervical spine as a function of level and anatomic location. STUDY DESIGN Cervical spine BMD was evaluated in vivo using a clinically relevant age group. PATIENT SAMPLE Twenty-two subjects (13 women and 9 men) were included with an average age of 48 ± 7 years (range, 35-61 years). Ten subjects were recently diagnosed with cervical radiculopathy (age 49 ± 8 years; six women and four men; and two smokers and eight nonsmokers), and 12 subjects were asymptomatic controls (age 46 ± 6 years; seven women and five men; and three smokers, three quit smoking, and six nonsmokers). OUTCOME MEASURES Physiologic measures included overall BMD for C3-C7, average BMD within 11 anatomically defined regions of interest for each vertebra, and density distribution (by volume) within each anatomic region and vertebral level. METHODS Subject-specific three-dimensional bone models were created from high-resolution computed tomography scans of the subaxial cervical spine (C3-C7). Custom software calculated the average BMD within 11 anatomically defined regions of interest for each three-dimensional bone model. Bone mineral density values for each voxel of bone tissue were binned into 50 mg/cc ranges to determine the density distribution by volume. Repeated-measures analysis of variance was used to test for differences within subjects by level (C3-C7) and anatomic location. The correlation between BMD in the central vertebral body and the pedicle and lateral mass regions was tested using Pearson correlation. RESULTS Average BMDs by level were 476, 503, 507, 473, and 414 mg/cm(3) for C3-C7, respectively. C3 and C6 BMDs were significantly less than those of C4 and C5 (p<.007). C7 BMD was significantly less than those of all other levels (all p<.001). Control and female subjects showed a trend toward higher BMD than radiculopathy and male subjects across all levels (p value: .06-.17). Wide variation in BMD was observed over anatomical regions, with the pedicles having significantly higher BMD than all other anatomic locations and the anterior portion of the central vertebral body having significantly lower BMD than all other anatomic locations. There was a significant positive correlation between central vertebral body BMD and lateral mass BMD at each level. Bone mineral density distribution by volume plots revealed women had a higher volume of very high-density bone than men but only in the posterior elements. CONCLUSIONS This study has characterized BMD in the cervical spine according to vertebral level and anatomic location within each vertebral level using live subjects from a clinically relevant age group. The results indicate significant differences in BMD according to vertebral level and among anatomical regions within each vertebra. The results suggest to the surgeon and device manufacturer that surgical procedures involving instrumentation attached to C7 may require a modification in instrumentation or in surgical technique to attain results equivalent to more superior levels. The results suggest to the basic scientist that computational models may be improved by taking into account the wide variation in BMD over different anatomical regions.
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