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Simon J, Donahue M, Docherty C. Development of the Identification of Functional Ankle Instability (IdFAI). Foot Ankle Int. 2012 Sep;33(9):755-63.

Critical review of self-reported functional ankle instability measures: a follow up

Reliability of the Identification of Functional Ankle Instability (IdFAI) Scale Across Different Age Groups in Adults

Adaptation and psychometric evaluation of the simplified Chinese version of the identification of functional ankle instability questionnaire in Chinese-speaking patients with chronic ankle instability disorders

Translation, cross-cultural adaptation, reliability, and validity of the Identification of Functional Ankle Instability questionnaire in Persian speaking participants with a history of ankle sprain

The reliability, and discriminative ability of the identification of functional ankle instability questionnaire, Japanese version

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

The IdFAI helps to examine individuals with FAI. The IdFAI can accurately establish an individual’s ankle stability status by gathering relevant information from ten questions. It is composed by 3 factors: 

• Factor 1 (history of ankle instability) included questions concerning feelings of instability during sports/recreational activities, the last time giving way episodes occurred, how often giving way occurs, and ability to stop ankle from continuing to roll over. These questions combined to reflect the general sense of ankle instability.  FAI implies disability during activity, and this factor addressed this component in addressing the presence of FAI.
• In Factor 2 (initial ankle sprain), analysis revealed questions such as how many ankle sprains the individual sustained, time since last ankle sprain, time weightbearing assistance was needed, and grade of ankle sprain diagnosed by a healthcare provider. This factor should provide a better assessment of the severity of previous ankle sprains.
• Factor 3 (instability during activities of daily living) was comprised of questions such as length of time following an ankle sprain required for the ankle to return to normal, as well as questions concerning instability during activities of daily living. These questions reflected instability during activities of daily motion.

To score the IdFAI, the administrator adds up each ordinal question for the total score