Lengthening the moment arm of the patella confers enhanced extensor mechanism power following total knee arthroplasty

This report has been verified by one or more authors of the original publication.

212 Patients scheduled to undergo TKA, with unilateral symptomatic knee osteoarthritis, were included in this trial to determine the efficacy of a novel prosthesis hypothesized to improve lower limb power output. Recent research has suggested that knee flexion/extension may occur around a fixed axis in the femur, which led to the development of a single-radius implant. Patients were randomized to implant groups with different joint radius designs: A single-radius group or a multi-radius group. The results of this study showed that patients who received the single radius implants experienced significantly greater extensor power (52 weeks after follow-up) than current traditional (multi-radius) techniques. However, this improved power did not translate to improved physical function.