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Translation, Cross‐cultural Adaptation, and Validation of the Dutch International Hip Outcome Tool‐33 (iHOT‐33 NL) in Young, Physically Active Individuals With Symptomatic Hip Joint Pathology

•STUDY DESIGN: Prospective cohort. •BACKGROUND: The international Hip Outcome Tool‐33 (iHOT‐33), developed in English, has been shown to be a valid and reliable questionnaire for young, physically active individuals with symptomatic hip joint pathology. •OBJECTIVES: To translate and validate the iHOT‐33 in Dutch (iHOT‐33 NL) in the target population. •METHODS: Translation and cross‐cultural adaptation of the iHOT‐33 were performed following existing guidelines. Young to middle‐aged (18‐50 years), active (Tegner activity score of 3 or greater) individuals presenting with symptomatic hip joint‐related pain (numeric pain‐rating score of 1 or greater) in a primary health care/hospital setting were included. The iHOT‐33 NL, Hip disability and Osteoarthritis Outcome Score (HOOS), European Quality of Life‐5 Dimensions questionnaire (EQ‐5D), numeric pain‐rating score, and Global Perceived Effect score were completed by 214 patients. •RESULTS: The intraclass correlation coefficient for test‐retest reliability was 0.92 (95% confidence interval: 0.88, 0.94). Smallest detectable changes at individual and group levels were, respectively, 16.7 and 1.1 points. The Cronbach alpha was .9. Principal‐component analysis revealed 4 domains of the iHOT‐33 NL. Of the hypotheses used for construct validity, 87% were confirmed. No floor and ceiling effects were detected for the iHOT‐33 NL total score. The minimal important change was 10.7 points. •CONCLUSION: The iHOT‐33 NL is a reliable and valid patient‐reported outcome questionnaire for young, physically active individuals with symptomatic hip joint pathology. It can be used in research and clinical settings.