Abstract
This study assessed the test-retest reliability and the sensitivity of self-paced walking time measurements for evaluating the functional performance of persons with knee osteoarthritis (OA). The 13 m timed walking tests were carried out on two separate occasions over a six-week period for 10 patients using a standardised protocol. The same measurements were recorded also for three additional patients before and after a six-week quadriceps strength training regimen. As indicated by an intraclass correlation coefficient of 0.83 with no significant intersession test differences for the group (P=0.98), the gait measurements were reliable. However, despite marked increase in knee extensor strength and significant subjective improvements in walking time for the three experimental subjects were smaller than the error of measurement. The findings suggest that regardless of reliability, measurements of self-paced level walking time might not be sufficiently sensitive for evaluating longitudinal changes in functional performance in this patient population.
Highlights
The findings suggest that regardless of reliability, measing time continue to be used for judging the efficacy of treatments for osteoarthritis (OA) of the Knee1’7, no study to date has
To allow a subject to walk at urements of self-paced level walk ing time might not be sufficiently sensitive for evaluating longitudinal investigated whether these measurements are reliable and sensitive to change in this patient population
Reliability The means, standard deviations and the 95 percent confidence intervals about the mean calculated for the walking tests are reported in Table II
Summary
Criteria were studied before and after com pletion of a six week isometric quadriceps strength training program. The same measurements were recorded for three additional patients before and after a six week quadriceps strength training regimen. Despite marked increase in knee extensor strength and significant subjective improvements in walking time for the three experimental sub jects were smaller than the error of kinematic measures of walk Procedures measurement. To allow a subject to walk at urements of self-paced level walk ing time might not be sufficiently sensitive for evaluating longitudinal investigated whether these measurements are reliable and sensitive to change in this patient population. It is important to ensure that walking time measurements designed to evaluate the efficacy of treatments for this condition are sensitive indicators of a change in func tional status.
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