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.
Gandhi
Rajiv
R
Division of Orthopaedic Surgery, University Health Network Department of Surgery, University of Toronto, Toronto, ON, Canada. Rajiv.Gandhi@uhn.on.ca
Tsvetkov
Dmitry
D
Davey
J Roderick
JR
Syed
Khalid A
KA
Mahomed
Nizar N
NN
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