Recovery of knee range and Oxford Knee Score post knee arthroplasty based on preoperative knee range is described. A total of 191 patients recruited across 5 hospitals were assessed preoperatively, at 8 weeks postoperatively and 1 year. Preoperative knee range was categorized into “low” (≤109), “moderate” (>109 to ≤120), and “high” (>120°) flexion and “normal” (± −5) and “restricted” (> +5°) terminal extension. Recovery was analyzed using MIXED modeling procedures. The low-flexion group gained flexion across time. The moderate-flexion and high-flexion groups lost flexion initially then recovered, but 1-year flexion remained lower than preoperative values. The restricted terminal extension group gained extension across time. The normal terminal extension group lost extension initially then recovered to preoperative values at 1 year. Recovery in Oxford score was independent of preoperative knee range limitation. Improvement in knee range postoperatively, but not self-reported behavior, is highly dependent on the initial restriction in range.
The Journal of Arthroplasty, Volume 27, Issue 6, 1100 - 1105
Improvements in Knee Range and Symptomatic and Functional Behavior After Knee Arthroplasty Based on Preoperative Restriction in RangeNaylor, Justine M. et al.