Cross-Cultural Adaptation, Validation, and Test-Retest Reliability of the Greek Version of the Victorian Institute of Sport Assessment for Gluteal Tendinopathy Questionnaire (VISA-G)

Purpose: The Victorian Institute of Sport Assessment-Gluteal (VISA-G) questionnaire is a widely used outcome measure for patients with Greater trochanteric pain syndrome (GTPS) that is available in different languages. Our purpose was to develop the Greek version of the VISA-G (VISA-G-Gr) and evaluate its psychometric properties including test-retest reliability and validity in a cohort of patients with GTPS. Methods: For the translation and cross-cultural adaptation process we followed the best available published guidelines and recommendations. Eighty patients with GTPS completed the VISA-G-Gr on two occasions (2 - 7 days) to evaluate test-retest reliability. In the first visit participants also completed the Greek versions of the Lower Extremity Functional Scale (LEFS) and the Modified Harris Hip Score (m-HHS) to assess convergent validity. Results: During translation and cross-cultural adaption, we needed to make some Minor wording adaptations to the questionnaire. The VISA-G-Gr was found to be reliable (intraclass correlation coefficient: 0.96, 95% confidence interval: 0.94 - 0.97) with a small measurement error (standard error of measurement: 3.9%, minimal detectable change: 9.1%). The questionnaire showed a strong correlation with the LEFS (0.81) and m-HHS (0.85). Conclusions: The VISA-G-Gr can be used as a reliable and valid patient reported outcome measure to evaluate the functional status of patients with GTPS.