Validity and reliability of Glittre activities of daily living test in lower-limb prosthetic users

Abstract

Background: Functional capacity assessments have an important role in determining the level of mobility in lower-limb prosthetic users. Objectives: Our aim was to investigate the reliability and validity of the Glittre activities of daily living (ADL) test in lower-limb prosthetic users. Study design: A cross-sectional study. Methods: The study included 66 people over the age of 18 years who had used a lower-limb prosthesis for at least 6 months and could walk at least 30 m independently. For construct validity, the correlation of the Glittre ADL test with the 2-min walk test, timed up and go test, and functional reach test was examined, and Bland-Altman agreement analysis was performed. Intra-rater reliability was examined with 2 tests performed by the same physiotherapist on different days, and inter-rater reliability was examined with a test performed by a second physiotherapist on a different day. Results: The reliability of the Glittre ADL test was found to be excellent for intra-rater (intraclass correlation coefficient = 0.940, 95% confidence interval = 0.903-0.963, standard error of measurement = 26.03, minimal detectable change = 72.31) and good for inter-rater (intraclass correlation coefficient = 0.890, 95% confidence interval = 0.806-0.936, standard error of measurement = 36.80, minimal detectable change = 102.06, p < 0.001). There was a strong negative correlation between Glittre ADL test and 2-min walk test (r = -0.785), a strong positive correlation with timed up and go (r = 0.805), and a weak negative correlation with functional reach test (r = -0.266, p < 0.05). Bland-Altman plots showed 95% agreement for both validity and reliability measurements. Conclusions: The Glittre ADL test is a valid and reliable test that can be used in the assessment of functional capacity in lower extremity prosthesis users.