Cross Cultural Adaptation of The Visa P Questionnaire for Danish Speaking Patients with Patella Tendinopathy

Introduction. Victorian Institute of Sports Assessment-Patella (VISA-P) questionnaire is a both valid and reliable Patient-Reported Outcome Measure (PROM) assessing the severity of Patella Tendinopathy (PT). The VISA-P questionnaire exists in several languages, but not in Danish. Objective. To translate and cross-culturally adapt the original VISA-P questionnaire for a Danish-speaking PT population and verify its psychometric properties to produce a validated Danish version of the VISA-P questionnaire. Methods. Translation and cross-cultural adaptation was performed according to international guidelines. Translation, synthesis, reverse translation, original authors' approval and pretesting were performed. Psychometric properties of VISA-P-DK were assessed on PT patients (n=86), healthy individuals (n=69) and on a PT patient group at 3-months follow-up. Results. Mean VISA-P-DK score in PT patients was 54 (95% Confidence Interval (CI) 50-57), significantly lower than the healthy control score of 99 (95% CI 98-100). Test-retest reliability of the VISA-P-DK was good (r=0.87 and ICC=0.88). Internal consistency was also good (Crohnbach's Alpha=0.83). Correlations between the VISAP-DK and scales measuring physical health by SF-36 (criterion validity) were in 2/3 cases moderate to good. No significant difference was found when comparing the PT group in the original study. Responsiveness showed a significant difference (p < 0.05) between baseline score and 3-months follow-up score. Conclusions. VISA-P-DK is a valid and reliable tool for measuring and monitoring of Danish-speaking PT patients. VISA-P-DK is easily applicable in the clinical setting, and its comparability with other VISA-P questionnaires makes it a useful tool in research.