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Relationship between self-reported and performance-based tests in a hip and knee joint replacement population.
Rajiv Gandhi1, Dmitry Tsvetkov, J Roderick Davey
1Division of Orthopaedic Surgery, University Health Network Department of Surgery, University of Toronto, Toronto, ON, Canada. Rajiv.Gandhi@uhn.on.ca
Clinical Rheumatology
|October 15, 2008
Summary
Assessing patient function after hip or knee replacement requires both self-reported questionnaires like WOMAC and performance-based tests such as the timed-up-and-go (TUG) test. These tools show a low-to-moderate relationship, indicating the need for comprehensive evaluation.
Area of Science:
- Orthopedics
- Rehabilitation Medicine
- Health Outcomes Research
Background:
- Hip and knee replacement patients often experience functional limitations.
- Assessing functional status is crucial for evaluating surgical outcomes and guiding rehabilitation.
- Existing assessment tools include self-reported measures and performance-based tests.
Purpose of the Study:
- To evaluate the correlation between self-reported outcomes (WOMAC, SF-36) and performance-based (TUG) measures in joint replacement patients.
- To identify predictors of functional status 12 weeks post-surgery using WOMAC and TUG scores.
Main Methods:
- A cohort of 200 patients undergoing hip or knee replacement was surveyed.
- Demographic data, WOMAC, SF-36, and TUG scores were collected at baseline and 12-week follow-up.
- Correlation and regression analyses were performed to assess relationships and identify predictors.
Main Results:
- Preoperative TUG scores showed weak correlations with SF-36 and WOMAC scores.
- Postoperative TUG scores demonstrated stronger correlations with WOMAC, SF-36 physical function, and role-physical scores.
- Age and preoperative TUG scores predicted 12-week TUG performance.
Conclusions:
- The relationship between self-reported and performance-based functional measures is low-to-moderate in joint replacement patients.
- Both types of assessment tools are necessary for a comprehensive understanding of patient disability.
- Age and baseline functional status are key predictors of recovery.