Test-retest reliability of the 50-foot timed walk and 30-second chair stand test in patients with total hip arthroplasty.

The purpose was to investigate the test-retest reliability of the 50-Foot Timed Walk (50FWT), and 30-Second Chair Stand Test (30CST) in the patients with total hip arthroplasty (THA). The study was a test-retest study. Thirty-seven patients with THA performed two trials for both the 30CTS and 50FWT on the same day with one hour interval. To assess reliability, the intra-class correlation coefficient [ICC(2,1)], standard error of measurement (SEM), the smallest real difference at the 95% confidence level (SRD95) were calculated. The ICCs for the 50FWT and 30CTS were 0.98 and 0.94, respectively. The SEM and SRD95 for the 50FWT and 30CTS were 0.3 and 0.8 seconds and 0.4 and 1.2 repeats, respectively. The test-retest reliability of the tests was very high. The 50FWT and 30CST are very reliable to measure the functional performance in patients with THA in the clinical settings.