Translation and Validation of the Spanish Version of the Banff Patellofemoral Instability Instrument 2.0.

Background: The Banff Patellofemoral Instability Instrument (BPII) 2.0 is a patient-reported outcome measure (PROM) tailored specifically for patellofemoral instability. The BPII 2.0 was developed in English and has been validated for adolescents and translated into several languages, but not into Spanish. Purpose/Hypothesis: This investigation involved translating the BPII 2.0 into Spanish and evaluating and validating its psychometric properties. It was hypothesized that there would be a moderate correlation between the Spanish BPII 2.0 and the Spanish version of the Kujala score. Study Design: Cohort study (diagnosis); Level of evidence, 3. Methods: The BPII 2.0 underwent forward and backward translations into Colombian Spanish according to the Consensus-Based Standards for the Selection of Health Measurement Instrument guidelines. Colombian patients aged 9 to 18 years who experienced knee symptoms after a primary or recurrent patellar dislocation were recruited from a hospital-based orthopaedic clinic. Participants completed the Spanish BPII 2.0 and the Kujala score during their initial visit (t Results: A total of 46 participants (31 [67%] female; mean age, 15.1 ± 2.0 years) were included. The mean time since first patellofemoral dislocation was 22 ± 28 months. Of the 4 participants who received operative treatment for patellar instability, the mean time since surgery was 12 months (range, 7-18 months). All patients completed the BPII 2.0 at t Conclusion: The Spanish BPII 2.0 had excellent internal consistency and test-retest reliability, suggesting this PROM is a reliable and valid questionnaire.