Journal
JOURNAL OF ARTHROPLASTY
Volume 18, Issue 3, Pages 286-294Publisher
CHURCHILL LIVINGSTONE INC MEDICAL PUBLISHERS
DOI: 10.1054/arth.2003.50046
Keywords
total knee arthroplasty; range of motion; outcome; Western McMaster Universities (WOMAC) osteoarthritis index
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Funding
- NIAMS NIH HHS [AR 36308, K24 AR 02123] Funding Source: Medline
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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 <95degrees flexion compared with patients with greater than or equal to95degrees (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.
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