Abstract
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.
Publisher
MJS Publishing, Medical Journals Sweden AB
Subject
Orthopedics and Sports Medicine,General Medicine,Surgery