• Shinshiro Mineta, Takayuki Inami, Mako Fukano, Takuma Hoshiba, Yuta Masuda, Akane Yoshimura, Tsukasa Kumai, and Norikazu Hirose.
• Graduate School of Sport Sciences, Waseda University, Higashifushimi, Nishitokyo, Japan.
• Phys Ther Sport. 2019 Jan 1; 35: 1-6.

ObjectiveTo assess the discriminability as well as the reliability, and internal consistency of the Identification of Functional Ankle Instability questionnaire translated into Japanese (IdFAI-J).DesignCross-sectional study.SettingCollegiate athletic training/sports medicine clinic.ParticipantsTwenty bilingual and sixty-five collegiate athletes including participants with and without functional instability (FI).Main Outcome MeasuresThe sensitivity, specificity, test retest reliability, and internal consistency of IdFAI-J.ResultsThe optimal cutoff score between the FI and non-FI participants was >10, with an area under the curve of 0.92. We calculated high sensitivity (0.94) and specificity (0.77) at the cutoff point. For the test-retest reliability, the intraclass correlation coefficient value of the IdFAI-J was 0.96; the standard error of measurement and minimal detectable change value was 1.69 and 3.60, respectively. Cronbach's α was 0.87; there was no improvement when a particular item was deleted from the scale.ConclusionsThe IdFAI-J has excellent discriminability, test-retest reliability, and internal consistency. Hence, the IdFAI-J significantly contribute to clinical practice and future research related to ankle instability in Japan.Copyright © 2018 Elsevier Ltd. All rights reserved.

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