Knee range of motion after total knee arthroplasty: How important is this as an outcome measure?
Andrew L. Miner; Elizabeth A. Wright; Jeffrey N. Katz; Elizabeth A. Lingard; Clement B. Sledge; William Gillespie; Colin Howie; Ian Annan; Peter Abernathy; Alistair Gibson; Judith Lane; Ian Pinder; David Weir; Nigel Brewster; Karen Bettinson; Maurice Needhoff; Roz Jackson; Tim Wilton; Peter Howard; Ian Forster; Paul Szyprt; Chris Moran; David Whitaker; Mike Bullock; Zena Hinchcliffe; Ian Learmonth; John Newman; Chris Ackroyd; George Langkamer; Robert Spencer; Mark Shannon; Evert Smith; John Dixon; Sarah Whitehouse; Frederick Ewald; Robert Poss; John Wright; Scott Martin; John Kwon; Yvette Valderrama; Steven Harwin; Michael Lichardi; Mark Mehlhoff; Linda Weiler; Tom Cahalan; Richard Cronk; Allyson Sandago; Stephen Rackermann; Emma McLaughlin; Peter Lewis; Robert Bauze; Tom Stevenson; Gordon Morrison; Jane ClasohmKnee
We investigated the relationship of knee range of motion (ROM) and function in a prospective, observational study of primary total knee arthroplasty (TKA). Preoperative and 12-month data were collected on 684 patients, including knee ROM, Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) pain and function questionnaire scores, patient satisfaction, and perceived improvement in quality of life (QOL). Only modest correlations were found between knee ROM and WOMAC function (r<0.34). At 12 months we found significantly worse WOMAC function scores for patients with <95° flexion compared with patients with ≥95° (mean, 61.9 vs 75.0; P<.0001). In linear regression models, WOMAC pain and function scores at 12 months were both correlates of patient satisfaction and perceived improvement in QOL (standardized beta>3.5; P<.0001), but knee flexion was not. For assessment of these outcomes, WOMAC function appears to be more important than knee flexion. © 2003 Elsevier Inc. All rights reserved.
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