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Tsikandylakis G, Mortensen KRL, Gromov K, Mohaddes M, Malchau H, Troelsen A. The Use of Large Metal Heads in Thin Vitamin E-Doped Cross-Linked Polyethylene Inserts Does Not Increase Polyethylene Wear in Total Hip Arthroplasty: 5-Year Results From a Randomized Controlled Trial. J Arthroplasty 2024; 39:1804-1810. [PMID: 38350518 DOI: 10.1016/j.arth.2024.02.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Revised: 01/30/2024] [Accepted: 02/05/2024] [Indexed: 02/15/2024] Open
Abstract
BACKGROUND Vitamin E-doped cross-linked polyethylene (VEPE) has encouraged the use of larger heads in thinner liners in total hip arthroplasty (THA). However, there are concerns about wear and mechanical failure of the thin liner, especially when metal heads are used. The aim of this randomized controlled trial was to investigate if the use of a large metal head in thin VEPE liner would increase polyethylene wear compared with a standard 32-mm metal head and to compare periacetabular radiolucencies and patient-reported outcomes in THA. METHODS There were 96 candidates for uncemented THA who were randomly allocated to either the largest possible metal head (36 to 44 mm) that could be fitted in the thinnest available VEPE liner (intervention group) or a standard 32-mm metal head (control group). The primary outcome was proximal head penetration, measured with a model-based radiostereometric analysis. Secondary outcomes were periacetabular radiolucencies and patient-reported outcomes. The midterm results of the trial at 5 years are presented. RESULTS The median total proximal head penetration (interquartile range) was -0.04 mm (-0.12 to 0.02) in the intervention group and -0.03 mm (-0.14 to 0.05) in the control group (P = .691). The rates of periacetabular radiolucencies were 1 of 44 and 4 of 42 (P = .197), respectively. Patient-reported hip function and health-related quality of life did not differ between the groups, but participants in the intervention group reported a higher level of activity (median University of California Level of Activity score 7 versus 6, P = .020). There were 5 revisions caused by dislocations (2), periprosthetic fracture (1), stem subsidence (1), or iliopsoas impingement (1). CONCLUSIONS Large metal heads in thin VEPE liners did not increase liner wear and were not associated with liner failure 5 years after THA.
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Affiliation(s)
- Georgios Tsikandylakis
- Department of Orthopaedics, Region of Västra Götaland, Sahlgrenska University Hospital, Mölndal, Sweden; Institute of Clinical Sciences, Department of Orthopaedics, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Kristian R L Mortensen
- Department of Orthopaedic Surgery, Copenhagen University Hospital Hvidovre, Hvidovre, Denmark; Faculty of Health Sciences, Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
| | - Kirill Gromov
- Department of Orthopaedic Surgery, Copenhagen University Hospital Hvidovre, Hvidovre, Denmark; Faculty of Health Sciences, Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
| | - Maziar Mohaddes
- Department of Orthopaedics, Region of Västra Götaland, Sahlgrenska University Hospital, Mölndal, Sweden; Institute of Clinical Sciences, Department of Orthopaedics, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Henrik Malchau
- Department of Orthopaedics, Region of Västra Götaland, Sahlgrenska University Hospital, Mölndal, Sweden; Institute of Clinical Sciences, Department of Orthopaedics, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden; Harris Orthopaedic Laboratory, Massachusetts General Hospital, Boston, Massachusetts; Harvard Medical School, Harvard University, Boston, Massachusetts
| | - Anders Troelsen
- Department of Orthopaedic Surgery, Copenhagen University Hospital Hvidovre, Hvidovre, Denmark; Faculty of Health Sciences, Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
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Saikko V. Statistical analysis of VEXLPE wear against alumina produced by a new 200-station, multidirectional pin-on-disk device. Proc Inst Mech Eng H 2024; 238:438-443. [PMID: 38439747 DOI: 10.1177/09544119241235789] [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] [Indexed: 03/06/2024]
Abstract
With low wear rates shown by contemporary bearing materials of total hip prostheses, the standard deviation of wear rate is relatively high. Therefore, large sample sizes are needed for an adequate power of test. Because wear tests take a long time, it is practical to test several samples simultaneously. A new high-capacity, multidirectional wear test device, called the SuperCTPOD-200, was introduced. A 3 million-cycle wear test with an unprecedented sample size of 200 was performed for VEXLPE. The duration of the test was 6 weeks. The wear factor was normally distributed with a mean ± SD of 1.64 × 10-7 mm3/Nm ± 0.22 × 10-7 mm3/Nm (n = 200). The observation that SD was 13.1% of the mean can be useful in power analyses of future tests with other highly cross-linked polyethylenes. Burnishing was the most typical feature on the worn pins, which was in agreement with clinical findings on retrieved acetabular liners. The present study emphasizes statistics that often plays a minor role only in wear studies.
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Affiliation(s)
- Vesa Saikko
- Department of Mechanical Engineering, Aalto University, Espoo, Finland
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El-Sahoury JAN, Kjærgaard K, Ovesen O, Hofbauer C, Overgaard S, Ding M. Vitamin E-diffused liners show less head penetration than cross-linked polyethylene liners in total hip arthroplasty: a ten-year multi-arm randomized trial. Bone Joint J 2023; 105-B:1052-1059. [PMID: 37777211 DOI: 10.1302/0301-620x.105b10.bjj-2023-0115.r1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/02/2023]
Abstract
Aims The primary outcome was investigating differences in wear, as measured by femoral head penetration, between cross-linked vitamin E-diffused polyethylene (vE-PE) and cross-linked polyethylene (XLPE) acetabular component liners and between 32 and 36 mm head sizes at the ten-year follow-up. Secondary outcomes included acetabular component migration and patient-reported outcome measures (PROMs) such as the EuroQol five-dimension questionnaire, 36-Item Short-Form Health Survey, Harris Hip Score, and University of California, Los Angeles Activity Scale (UCLA). Methods A single-blinded, multi-arm, 2 × 2 factorial randomized controlled trial was undertaken. Patients were recruited between May 2009 and April 2011. Radiostereometric analyses (RSAs) were performed from baseline to ten years. Of the 220 eligible patients, 116 underwent randomization, and 82 remained at the ten-year follow-up. Eligible patients were randomized into one of four interventions: vE-PE acetabular liner with either 32 or 36 mm femoral head, and XLPE acetabular liner with either 32 or 36 mm femoral head. Parameters were otherwise identical except for acetabular liner material and femoral head size. Results A total of 116 patients participated, of whom 77 were male. The median ages of the vE-PE 32 mm and 36 mm groups were 65 (interquartile range (IQR) 57 to 67) and 63 years (IQR 56 to 66), respectively, and of the XLPE 32 mm and 36 mm groups were 64 (IQR 58 to 66) and 61 years (IQR 54 to 66), respectively. Mean total head penetration was significantly lower into vE-PE acetabular liner groups than into XLPE acetabular liner groups (-0.219 mm (95% confidence interval -0.348 to -0.090); p = 0.001). There were no differences in wear according to head size, acetabular component migration, or PROMs, except for UCLA. There were no cases of aseptic loosening or failures requiring revision at long-term follow-up. Conclusion Significantly lower wear was observed in vE-PE acetabular liners than in XLPE acetabular liners. No difference in wear was observed between different head size or PROMs except for the UCLA at ten years.
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Affiliation(s)
- Joseph A N El-Sahoury
- Department of Orthopaedic Surgery and Traumatology, and Department of Clinical Research, Orthopaedic Research Laboratory, Odense University Hospital, University of Southern Denmark, Odense, Denmark
| | - Kristian Kjærgaard
- Department of Orthopaedic Surgery and Traumatology, and Department of Clinical Research, Orthopaedic Research Laboratory, Odense University Hospital, University of Southern Denmark, Odense, Denmark
| | - Ole Ovesen
- Department of Orthopaedic Surgery and Traumatology, and Department of Clinical Research, Orthopaedic Research Laboratory, Odense University Hospital, University of Southern Denmark, Odense, Denmark
| | | | - Søren Overgaard
- Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
- Department of Orthopaedic Surgery & Traumatology, Copenhagen University Hospital, Copenhagen, Denmark
| | - Ming Ding
- Department of Orthopaedic Surgery and Traumatology, and Department of Clinical Research, Orthopaedic Research Laboratory, Odense University Hospital, University of Southern Denmark, Odense, Denmark
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Zheng C, Xu J, Wu L, Wu Y, Liu Y, Shen B. Comparisons of Different Bearing Surfaces in Cementless Total Hip Arthroplasty: A Systematic Review and Bayesian Network Analysis. J Arthroplasty 2023; 38:600-609. [PMID: 36265721 DOI: 10.1016/j.arth.2022.10.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/11/2022] [Revised: 10/06/2022] [Accepted: 10/11/2022] [Indexed: 11/05/2022] Open
Abstract
BACKGROUND We aimed to make comparisons of different bearing surfaces in patients after cementless total hip arthroplasty. METHODS The network meta-analysis was guided by the Preferred Reporting Items for Systematic Reviews and Meta-analysis (PRISMA) guideline. The primary outcomes were implant survival and Harris hip score (HHS). Secondary outcomes included linear wear rates and serum level of metal ions. Subgroup analyses were performed by: (1) classifying head sizes as small and large; (2) femoral heads as ceramic and metal; and (3) liners as metal, ceramic, polyethylene, highly cross-linked polyethylene (HXP), or vitamin E-infused highly cross-linked polyethylene (HXPE). A total of 64 eligible RCTs with different bearings were assessed. Overall inconsistency and heterogeneity were acceptable. RESULTS In the 10 years follow-up, metal-on-polythene and ceramic-on-polythene bearings with small heads showed higher risk for revisions compared with metal-on-HXP and ceramic-on-HXP bearings with small heads. Similarly, only metal or ceramic-on-polythene bearings with small heads showed inferiority in HHS compared with other bearings. Conventional polyethylene liners showed higher linear wear rates compared with HXP, HXPE, and ceramic liners at 5 and 10 years after surgery, while metal-on-metal and ceramic-on-metal bearings showed higher serum level of cobalt and chromium. CONCLUSION Bearings containing HXP, HXPE, and ceramic liners showed comparable survivorship and hip function at follow-up of 5 and 10 years. Hard-on-hard bearings containing metal had higher serum level of metal ions than others. Bearings containing conventional polyethylene had worse performance in terms of implant survival, hip function, and wear rates. LEVEL OF EVIDENCE Level I.
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Affiliation(s)
- Che Zheng
- Department of Orthopaedics, West China Hospital, Sichuan University, Chengdu, Sichuan Province, China
| | - Jiawen Xu
- Department of Orthopaedics, West China Hospital, Sichuan University, Chengdu, Sichuan Province, China
| | - Liming Wu
- Department of Orthopaedics, West China Hospital, Sichuan University, Chengdu, Sichuan Province, China
| | - Yuangang Wu
- Department of Orthopaedics, West China Hospital, Sichuan University, Chengdu, Sichuan Province, China
| | - Yuan Liu
- Department of Orthopaedics, West China Hospital, Sichuan University, Chengdu, Sichuan Province, China
| | - Bin Shen
- Department of Orthopaedics, West China Hospital, Sichuan University, Chengdu, Sichuan Province, China
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Fransen BL, Bengoa FJ, Neufeld ME, Sheridan GA, Garbuz DS, Howard LC. Thin highly cross-linked polyethylene liners combined with large femoral heads in primary total hip arthroplasty show excellent survival and low wear rates at a mean follow-up of 12.8 years. Bone Joint J 2023; 105-B:29-34. [PMID: 36587249 DOI: 10.1302/0301-620x.105b1.bjj-2022-0812.r1] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
AIMS Several short- and mid-term studies have shown minimal liner wear of highly cross-linked polyethylene (HXLPE) in total hip arthroplasty (THA), but the safety of using thinner HXLPE liners to maximize femoral head size remains uncertain. The objective of this study was to analyze clinical survival and radiological wear rates of patients with HXLPE liners, a 36 mm femoral head, and a small acetabular component with a minimum of ten years' follow-up. METHODS We retrospectively identified 55 patients who underwent primary THA performed at a single centre, using HXLPE liners with 36 mm cobalt-chrome heads in acetabular components with an outer diameter of 52 mm or smaller. Patient demographic details, implant details, death, and all-cause revisions were recorded. Cox regression and Kaplan-Meier survival was used to determine all-cause and liner-specific revision. Of these 55 patients, 22 had a minimum radiological follow-up of seven years and were assessed radiologically for linear and volumetric wear. RESULTS Overall survival rate for all-cause revision was 94.5% (95% confidence interval (CI) 81.7% to 97.2%) at a mean follow-up of 12.8 years (10.9 to 18.7). Three patients were revised, none for liner wear, fracture, or dissociation. A total of 22 patients were included in the radiological analysis (mean follow-up 9.9 years (7.5 to 13.7)). Mean linear liner wear was 0.085 mm (95% CI -0.086 to 0.257) and the volumetric wear rate was 11.097 mm3/year (95% CI -6.5 to 28.7). CONCLUSION Using HXLPE liners with 36 mm heads in 52 mm acetabular components or smaller is safe, with excellent survival and low rates of linear and volumetric wear at medium-term follow-up. Patients did not require revision surgery for liner complications such as fracture, dissociation, or wear. Our results suggest that the advantages of using larger heads outweigh the potential risks of using thin HXLPE liners.Cite this article: Bone Joint J 2023;105-B(1):29-34.
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Affiliation(s)
- Bas L Fransen
- Department of Orthopaedics, The University of British Columbia, Vancouver, Canada
| | - Francisco J Bengoa
- Department of Orthopaedics, The University of British Columbia, Vancouver, Canada
| | - Michael E Neufeld
- Department of Orthopaedics, The University of British Columbia, Vancouver, Canada
| | - Gerard A Sheridan
- Department of Orthopaedics, The University of British Columbia, Vancouver, Canada
| | - Donald S Garbuz
- Department of Orthopaedics, The University of British Columbia, Vancouver, Canada
| | - Lisa C Howard
- Department of Orthopaedics, The University of British Columbia, Vancouver, Canada
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Nielson T, Owens G, Miller B, Meneghini E, Deckard ER, Meneghini RM. Large Femoral Heads in Total Hip Arthroplasty With Vitamin E Highly Cross-Linked Polyethylene: Head Penetration Rates Compared to Highly Cross-Linked Polyethylene. J Arthroplasty 2022; 37:S685-S691. [PMID: 35227535 DOI: 10.1016/j.arth.2022.01.075] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Revised: 01/20/2022] [Accepted: 01/24/2022] [Indexed: 02/02/2023] Open
Abstract
BACKGROUND Highly cross-linked polyethylene with vitamin E (VE-HXLPE) has shown superior tribological properties and has been rapidly adopted in total hip arthroplasty. However, the majority of studies compare VE-HXLPE to conventional or moderately cross-linked polyethylene using standard femoral head sizes. This study's purpose was 2-fold: (1) compare radiographic femoral head penetration (FHP) between VE-HXLPE and HXLPE and (2) evaluate FHP in large femoral heads ≥40 mm. METHODS One hundred forty-two consecutive primary total hip arthroplasties using ceramic femoral heads (n = 84 VE-HXLPE; n = 58 HXLPE) in a single implant system were retrospectively reviewed. FHP was measured radiographically utilizing Martell method at 4-week, 1-year, and latest radiographs. FHP, cup position, and demographic variables were compared between VE-HXLPE and HXLPE liners. RESULTS Median linear FHP was lower for VE-HXLPE compared to HXLPE during the initial "bedding-in" period between 4-week and 1-year (0.383 vs 0.551 mm, P = .650) and between 1-year and latest follow-up (0.131 vs 0.270 mm/y, P = .636) although without statistical significance. Acetabular cup inclination and anteversion did not influence linear or volumetric FHP (P ≥ .204). Large femoral heads (≥40 mm) were predictive of higher FHP during the early bedding-in period (P ≤ .025) but did not have an effect beyond 1 year in multivariate regression with numbers available. No radiographic osteolysis was observed in any case. CONCLUSION These findings support others that VE-HXLPE is the optimal polyethylene bearing surface to minimize FHP during the bedding-in period and beyond. Surprisingly, large ceramic femoral heads appear to influence FHP during the initial bedding-in period but do not increase FHP beyond 1 year. Further longer term follow-up remains warranted. LEVEL OF EVIDENCE III.
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Affiliation(s)
- Trent Nielson
- Department of Orthopaedic Surgery, Indiana University School of Medicine, Indianapolis, IN
| | - Garrett Owens
- Department of Orthopaedic Surgery, Indiana University School of Medicine, Indianapolis, IN
| | - Brandon Miller
- Department of Mechanical Engineering, Tennessee Tech University, Cookeville, TN
| | - Ethan Meneghini
- IU Health Hip & Knee Center, IU Health Saxony Hospital, Fishers, IN
| | - Evan R Deckard
- Department of Orthopaedic Surgery, Indiana University School of Medicine, Indianapolis, IN
| | - R Michael Meneghini
- Department of Orthopaedic Surgery, Indiana University School of Medicine, Indianapolis, IN; IU Health Hip & Knee Center, IU Health Saxony Hospital, Fishers, IN
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Tateiwa T, Affatato S, Takahashi Y, Shishido T, Pezzotti G, Yamamoto K. To what extent could the acetabular liner thickness be reduced yet remaining tribologically acceptable in metal-on-vitamin E-diffused crosslinked polyethylene hip arthroplasty? J Biomed Mater Res B Appl Biomater 2022; 110:2299-2309. [PMID: 35524679 DOI: 10.1002/jbm.b.35078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Revised: 03/07/2022] [Accepted: 04/18/2022] [Indexed: 11/05/2022]
Abstract
The aim of the present study was to evaluate how much reduction in acetabular liner thickness could be tribologically acceptable in metal-on-vitamin-E diffused highly crosslinked ultra-high molecular weight polyethylene (Vit-E XLPE) bearings for total hip arthroplasty. We tested thick- (10.3 mm), moderate- (6.3 mm), and thin- (4.3 mm) Vit-E XLPE liners coupled with 28-mm cobalt-chromium femoral heads on a hip simulator to 5 million cycles, and peak contact stress was predicted based on mathematical modeling. Wear damage was also evaluated in terms of surface topology and morphology. Wear simulation demonstrated that the 2-4 mm thickness reduction (6.3 → 4.3 mm and 10.3 → 6.3 mm) did not significantly affect the wear rate for Vit-E XLPE liner, whereas 6-mm reduction (10.3 → 4.3 mm) significantly increased liner wear (by 309%) and head roughness (by 415%). This effect was attributed to a contact stress increase (by 24-41%). However, the wear rates for all thicknesses tested were much lower than those previously reported for thicker non-crosslinked materials. The original crystalline morphology was maintained in all liners after wear. Our results suggest that the 2-4 mm thickness reduction may be tribologically acceptable in Vit-E XLPE liners. However, more severe and longer term simulations are necessary to determine a minimum acceptable thickness.
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Affiliation(s)
- Toshiyuki Tateiwa
- Department of Orthopedic Surgery, Tokyo Medical University, Tokyo, Japan
| | - Saverio Affatato
- Laboratorio di Tecnologia Medica, IRCCS Istituto Ortopedico Rizzoli, Bologna, Italy
| | - Yasuhito Takahashi
- Department of Orthopedic Surgery, Tokyo Medical University, Tokyo, Japan.,Department of Bone and Joint Biomaterial Research, Tokyo Medical University, Tokyo, Japan
| | - Takaaki Shishido
- Department of Orthopedic Surgery, Tokyo Medical University, Tokyo, Japan
| | - Giuseppe Pezzotti
- Department of Orthopedic Surgery, Tokyo Medical University, Tokyo, Japan.,Ceramic Physics Laboratory, Kyoto Institute of Technology, Kyoto, Japan
| | - Kengo Yamamoto
- Department of Orthopedic Surgery, Tokyo Medical University, Tokyo, Japan
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Scott CEH, Clement ND, Davis ET, Haddad FS. Modern total hip arthroplasty: peak of perfection or room for improvement? Bone Joint J 2022; 104-B:189-192. [PMID: 35094584 DOI: 10.1302/0301-620x.104b2.bjj-2022-0007] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Chloe E H Scott
- Royal Infirmary of Edinburgh, Edinburgh, UK.,The Bone & Joint Journal , London, UK.,Bone & Joint Research , London, UK.,University of Edinburgh, Edinburgh, UK
| | | | | | - Fares S Haddad
- The Bone & Joint Journal , London, UK.,University College London Hospitals, The Princess Grace Hospital, and The NIHR Biomedical Research Centre at UCLH, London, UK
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Orita K, Goto K, Kuroda Y, Kawai T, Okuzu Y, Matsuda S. Wear resistance of first-generation highly cross-linked annealed polyethylene in cementless total hip arthroplasty is maintained 20 years after surgery. Bone Joint J 2022; 104-B:200-205. [PMID: 35094568 DOI: 10.1302/0301-620x.104b2.bjj-2021-1079.r1] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
AIMS The aim of this study was to evaluate the performance of first-generation annealed highly cross-linked polyethylene (HXLPE) in cementless total hip arthroplasty (THA). METHODS We retrospectively evaluated 29 patients (35 hips) who underwent THA between December 2000 and February 2002. The survival rate was estimated using the Kaplan-Meier method. Hip joint function was evaluated using the Japanese Orthopaedic Association (JOA) score. Two-dimensional polyethylene wear was estimated using Martell's Hip Analysis Suite. We calculated the wear rates between years 1 and 5, 5 and 10, 10 and 15, and 15 and final follow-up. RESULTS The mean follow-up period was 19.1 years (SD 0.6; 17.3 to 20.1). The 19-year overall survival rate with the end point of all-cause revision was 97.0% (95% confidence interval (CI) 91 to 100). The mean JOA score improved from 43.2 (SD 10.6; 30 to 76) before surgery to 90.2 (SD 6.4; 76 to 98) at the final follow-up (p < 0.001). There was no osteolysis or loosening of the acetabular or femoral components. The overall steady-state wear rate was 0.013 mm/year (SD 0.012). There was no hip with a steady-state wear rate of > 0.1 mm/year. There was no significant difference in wear rates for each period. We found no significant correlation between the wear rate and age, body weight, BMI, or cup inclination. CONCLUSION First-generation annealed HXLPE shows excellent wear resistance and no acceleration of wear for approximately 20 years, with low all-cause revision rates. Cite this article: Bone Joint J 2022;104-B(2):200-205.
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Affiliation(s)
- Kazuki Orita
- Department of Orthopaedic Surgery, Kyoto University Hospital, Kyoto, Japan
| | - Koji Goto
- Department of Orthopaedic Surgery, Kyoto University Hospital, Kyoto, Japan
| | - Yutaka Kuroda
- Department of Orthopaedic Surgery, Kyoto University Hospital, Kyoto, Japan
| | - Toshiyuki Kawai
- Department of Orthopaedic Surgery, Kyoto University Hospital, Kyoto, Japan
| | - Yaichiro Okuzu
- Department of Orthopaedic Surgery, Kyoto University Hospital, Kyoto, Japan
| | - Shuichi Matsuda
- Department of Orthopaedic Surgery, Kyoto University Hospital, Kyoto, Japan
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