The hypothesis is to translate and culturally adapt the scale successfully and demonstrate a good factorial structure and psychometric properties, replicating the results of the original English version of the questionnaire
The purpose of the study is actually the translation, cultural adaptation and psychometric validation in the Italian Version of the Identification of Functional Ankle Instability (IdFAI) English Version for use in outpatient clinics in non-English subjects to objectify chronic ankle instability.