Relationship between self-reported and performance-based tests in a hip and knee joint replacement population.
Our objectives were: (1) to assess the relationship between self-reported measures (Western Ontario and McMaster University Osteoarthritis Index (WOMAC) and Medical Outcomes Study Short Form-36 (SF-36)) and a performance-based timed-up-and-go (TUG) test in a hip and knee joint replacement population and (2) to determine the predictors of postoperative functional status as measured by the 12-week WOMAC and TUG scores. We surveyed 200 patients undergoing primary hip or knee replacement surgery for demographic data and outcome scores at baseline and 12-week follow-up. There was a weak correlation between preoperative TUG scores and preoperative SF-36 physical function scores (r = -0.28, p < 0.0001), SF-36 role-physical scores (r = -0.21, p = 0.0022) and WOMAC (r = 0.29, p < 0.0001) scores. The relationship was stronger between the postoperative TUG scores and WOMAC scores (r = 0.43, p < 0.0001), SF-36 physical function scores (r = -0.39, p < 0.0001) and SF-36 role-physical (r = -0.33, p < 0.0001) scores. Significant predictors for the TUG test at 12-week follow-up were age (p = 0.004) and preoperative TUG scores (p < 0.0001). Given low-to-moderate relationship between self-reported and performance-based tools, both tests are needed to assess the true level of patient disability.
Division of Orthopaedic Surgery, University Health Network Department of Surgery, University of Toronto, Toronto, ON, Canada. Rajiv.Gandhi@uhn.on.ca
Rajiv
R
Gandhi
Dmitry
D
Tsvetkov
J Roderick
JR
Davey
Khalid A
KA
Syed
Nizar N
NN
Mahomed
D000203:Activities of Daily Living / Q000145:classification*; D000368:Aged; D019644:Arthroplasty, Replacement, Hip; D019645:Arthroplasty, Replacement, Knee; D004185:Disability Evaluation; D005260:Female; D006304:Health Status; D006801:Humans; D008297:Male; D015207:Osteoarthritis, Hip / Q000503:physiopathology / Q000601:surgery*; D020370:Osteoarthritis, Knee / Q000503:physiopathology / Q000601:surgery*; D010147:Pain Measurement; D010549:Personal Satisfaction; D016059:Range of Motion, Articular; D012189:Retrospective Studies; D016353:Self-Examination / Q000379:methods*; D012720:Severity of Illness Index