Translation, cross-cultural adaptation, and measurement properties of the Brazilian version of the Identification of Functional Ankle Instability (IdFAI) questionnaire

摘要

Abstract Objectives The aim of this research was to describe the translation and cultural adaptation, and to test the validity and reliability of the Brazilian version of the Identification of Functional Ankle Instability (IdFAI) questionnaire. Design This was a clinical measurement. Setting This research took place at the Federal University of Sao Paulo in Brazil. Participants Fifty college students participated in the translation and cultural adaptation, while another 50 students participated in the measurements (validity and reliability). Main outcome measures The cross-cultural adaptation of the Brazilian IdFAI was accomplished using standard guidelines. For the validity and reliability, the individuals were asked to complete the IdFAI tests on the same day, and after two weeks maximum. The validity was assessed by correlating the Brazilian IdFAI with the Visual Analog Scale for Instability (VAS-I), the Cumberland Ankle Instability Tool (CAIT), and the Lower Extremity Functional Scale (LEFS) using Spearman's correlation coefficient. The test-retest reliability and internal consistency were determined by using an intraclass correlation (ICC 2,1 ) and Cronbach's α , respectively. The agreement [standard error of measurement (SEM) and minimal detectable change at 90% (MDC 90 )] and the floor and ceiling effects were also assessed. Results The Brazilian IdFAI had strong correlation with the CAIT and moderate correlations with the VAS-I and LEFS scale, with excellent reliability, internal consistency and agreement. No ceiling or floor effects were observed. Conclusion The Brazilian IdFAI questionnaire is a valid and reliable instrument to identify functional ankle instability. It can be used in both clinical and research settings. Highlights ? IdFAI is an accepted instrument to be used across different languages and cultures. ? The Brazilian version of the IdFAI is a helpful instrument to determine CAI. ? IdFAI contribute to the standardization of CAI populations from different countries. ? IdFAI-Brazil showed excellent validity, internal consistency and agreement. ? IdFAI-Brazil is a reliable instrument to be used by different evaluators.