Short versus conventional straight stem in uncemented total hip arthroplasty: functional outcomes up to 5 years and survival up to 12 years: secondary results of a randomized controlled trial
DOI:
https://doi.org/10.2340/17453674.2024.39964Abstract
Background and purpose: To date, the mid- and long-term outcomes of the Collum Femoris Preserving (CFP) stem compared with conventional straight stems are unknown. We aimed to compare physical function at a 5-year follow-up and implant survival at an average of 10-year follow-up in an randomized controlled trial (RCT).
Methods: This is a secondary report of a double-blinded RCT in 2 hospitals. Patients aged 18–70 years with hip osteoarthritis undergoing an uncemented primary THA were randomized to a CFP or a Zweymüller stem. Patient-reported outcomes, clinical tests, and radiographs were collected at baseline, 2, 3, 4, and 5 years postoperatively. Primary outcome was the Hip disability and Osteoarthritis Outcome Score (HOOS) function in activities of daily living (ADL) subscale. Secondary outcomes were other patient-reported outcomes, clinical tests, adverse events, and implant survival. Kaplan–Meier and competing risk survival analyses were performed with data from the Dutch Arthroplasty Registry.
Results: We included 150 patients. Mean difference between groups on the HOOS ADL subscale at 5 years was –0.07 (95% confidence interval –5.1 to 4.9). Overall survival was 92% for the CFP and 96% for the Zweymüller stem. No significant difference was found.
Conclusion: No significant differences were found in physical function at 5-year and implant survival at 10-year follow-up between the CFP and Zweymüller stems. When taking cup revisions into account, the CFP group showed clinically inferior survival.
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Copyright (c) 2024 Loes W A H van Beers, Esther Scheijbeler, Jakob van Oldenrijk, Carel H Geerdink, Bob B A M Niers, Nienke W Willigenburg, Rudolf W Poolman
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