Validity and Reliability of the Japanese Version of the Victorian Institute of Sports Assessment for Patellar Tendinopathy (VISA-P-J): A prospective cohort study

Background: This study aimed to translate, adapt, and test the psychometric properties of the Japanese version of the Victorian Institute of sports assessment for patellar tendinopathy (VISA-P-J) according to the COnsensus-based Standards for the selection of health Measurement INstruments (COSMIN).Methods: This prospective cohort study registered 43 participants ≥18 years old with a history of painful symptoms in the inferior pole of the patella to the proximal patellar tendon lasting ≥1 month. Pain in daily life and during sports activities, symptom classification, and patient global impression of change (PGIC) were assessed at the baseline, 1 week, and 12 weeks. The psychometric properties of the VISA-P-J were calculated according to the COSMIN.Results: The intraclass correlation coefficient (ICC)2,1 for test-retest reliability was 0.87 (pConclusion: We demonstrated that the VISA-P-J, based on the COSMIN, was a reliable, valid, and responsive assessment method for individuals with chronic pain in the patellar tendon.