Reliability and Validity of Two Performance-Based Outcome Measures in Rehabilitation Following Total Knee Arthroplasty
Abstract
Objectives: Performance-based outcome measures (PBOM) are suggested to evaluate change in function during rehabilitation after total knee arthroplasty (TKA). The purpose of this study was to evaluate the measurement properties of the 30-Second Chair Stand Test (30CST) and 10-Metre Walk Test (10MWT) in patients following TKA.
Methods: Eighty-three patients completed two PBOM on three occasions following surgery. Patients also completed the Western Ontario and McMaster Universities Osteoarthritis Index and Global Rating of Change (GRC).
Results: Intraclass correlation coefficients ranged from 0.82 to 0.96. The standard errors of measurement at 6 and 12 weeks postop, respectively, were: 30CST ±0.67 and ±0.79, 10MWT ±1.05 and ±0.57. Minimal detectable changes (90% confidence level) were: 30CST ±1.56 and ±1.84, 10MWT ±2.43 and ±1.32. Correlations between change in PBOM and GRC ranged from -0.16 to 0.34.
Conclusions: These results support the reliability, validity and clinical use of the 30CST and 10MWT during rehabilitation following TKA.