title: Improvements in knee range and symptomatic and functional behavior after knee arthroplasty based on preoperative restriction in range.
abstract: 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.
authors: University of New South Wales, Sydney, NSW, Australia.
authors: Justine M
authors: JM
authors: Naylor
authors: Anthony E T
authors: AE
authors: Yeo
authors: Rajat
authors: R
authors: Mittal
authors: Victoria W M
authors: VW
authors: Ko
authors: Ian A
authors: IA
authors: Harris
mesh_terms: D000368:Aged; D019645:Arthroplasty, Replacement, Knee; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007719:Knee Joint / Q000502:physiology* / Q000601:surgery; D007720:Knee Prosthesis; D008297:Male; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000601:surgery*; D011184:Postoperative Period; D057234:Preoperative Period; D016059:Range of Motion, Articular / Q000502:physiology*; D020127:Recovery of Function / Q000502:physiology; D012727:Sex Characteristics; D016896:Treatment Outcome