In vivo wear measurement in a modern total knee arthroplasty with model-based radiostereometric analysis.

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Abstract

[Indexed for MEDLINE] 19. Kans J Med. 2025 Aug 15;18(4):83-85. doi: 10.17161/kjm.vol18.23669. eCollection 2025 Jul-Aug. Comparison of Polyethylene Thickness and Constraint in Traditional and Robotic-Assisted Total Knee Arthroplasty. Kindel LW(1), Zackula RE(2), Schotte AL(3), Yang SY(1), Pappademos PC(1)(3). Author information: (1)Department of Orthopaedic Surgery, The University of Kansas School of Medicine-Wichita, Wichita, Kansas. (2)Office of Research, The University of Kansas School of Medicine-Wichita, Wichita, Kansas. (3)Advanced Orthopaedic Associates, PA, Wichita, Kansas. INTRODUCTION: Thicker polyethylene inserts in total knee arthroplasty (TKA) may be associated with increased wear rates, a higher risk of implant failure, and the need for revision surgery. The authors of this study aimed to compare polyethylene insert thickness in robotic-assisted TKA versus conventional manual TKA. METHODS: The authors conducted a cross-sectional study on patients with end-stage primary knee osteoarthritis who underwent TKA by a single fellowship-trained orthopedic surgeon over a two-year period. Patients with post-traumatic or inflammatory arthropathy or those undergoing revision arthroplasty were excluded. Demographics, implant manufacturer and type, and polyethylene insert thickness were recorded in an electronic database. Bivariate analyses, including t-tests, Mann-Whitney U tests, and Fisher's exact tests were used to compare robotic-assisted and manual TKA procedures. RESULTS: Data from 222 patients were analyzed, with 111 in each group. The mean (standard deviation [SD]) age at surgery was similar between groups: 64.3 (8.2) years for robotic-assisted and 62.3 (8.8) years for the manual group (p = 0.398). Polyethylene insert thickness differed significantly: the median was 9 mm (range 9-13 mm) in the robotic-assisted group versus 11 mm (range 9-16 mm) in the manual group (p