Comparison of Modular Conventional and High-Flexion Posterior-Stabilized Total Knee Arthroplasties in the Same Patients at a Mean Follow-Up of 15 Years |
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| Institution: | 1. Joint Replacement Center, Seoul Metropolitan SeoNam Hospital, Seoul, Republic of Korea;2. Department of Orthopedic Surgery, Ewha Womans University Seoul Hospital, Seoul, Republic of Korea;1. Department of Orthopaedic Surgery, Inspira Health, Vineland, NJ;2. Department of Orthopaedic Surgery, The Rothman Institute, Egg Harbor Township, NJ;3. Advanced Orthopedics and Sports Medicine Institute, Freehold, NJ;4. Department of Orthopaedic Surgery, Thomas Jefferson University, Philadelphia, PA;1. Rothman Institute, Thomas Jefferson University, Philadelphia, PA;2. Department of Orthopaedics, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan, ROC;3. Graduate Institute of Medical Science, National Defense Medical Center, Taipei, Taiwan, ROC;4. Department of Orthopaedic Surgery, General Hospital of People’s Liberation Army, Beijing, People’s Republic of China;1. Department of Orthopaedic Surgery, University of Alabama at Birmingham, Birmingham, AL;2. UAB School of Medicine, Birmingham, AL;3. Department of Epidemiology, UAB School of Public Health, Birmingham, AL;1. Department of Orthopaedic Surgery, Medical University Innsbruck, Innsbruck, Austria;2. Department of Orthopaedic Surgery-Experimental Orthopaedics, Medical University Innsbruck, Innsbruck, Austria;3. Department of Clinical Epidemiology of Tirol Kliniken GmbH, Innsbruck, Austria |
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| Abstract: | BackgroundAs previous studies are limited to short-term clinical data on conventional and high-flexion total knee arthroplasties (TKAs), long-term clinical data on these TKAs remain unclear. Therefore, we evaluated long-term functional outcome, range of knee motion, revision rate, implant survival, and the prevalence of osteolysis after conventional and high-flexion TKAs in the same patients.MethodsThe authors evaluated a cohort of 1206 patients with a mean age of 65.3 ± 7 years (range: 22-70) who underwent bilateral simultaneous sequential TKAs. One knee received a conventional TKA and the other received a high-flexion TKA. The mean duration of follow-up was 15.6 years (range: 14-17).ResultsNo significant differences were found between the 2 groups at the latest follow-up with respect to Knee Society score (93 vs 92 points, P = .765), pain score (45 vs 44 points, P = .641), range of knee motion (125° vs 126°, P = .712), and radiographic and computed tomography scan results. Furthermore, no significant revision rate differences were found between the 2 groups (1.3% for conventional TKA vs 1.6% for high-flexion TKA; P = .137). There was no osteolysis recorded in either group. The rate of survivorship free of implant revision or aseptic loosening was 98.7% (95% CI = 91-100) for conventional TKA and 98.4% (95% CI = 91-100) for high-flexion TKA at 17 years.ConclusionAt the latest follow-up, we were not able to demonstrate any significant difference between conventional and high-flexion TKAs with respect to functional outcome scores, range of knee motion, revision rate, implant survival, and prevalence of osteolysis. |
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| Keywords: | long-term outcome conventional total knee arthroplasty high-flexion total knee arthroplasty posterior-stabilized knee prosthesis same patient |
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