• Yinuo Li, Raymond Chi-Chung Tsang, Dongsen Liu, Bing Ruan, Yue Yu, and Qi Gao.
• School of Sports Medicine and Rehabilitation, Beijing Sport University, Beijing 100084, China.
• Phys Ther Sport. 2021 Mar 1; 48: 116-120.

ObjectiveTo examine the applicability of Chinese Cumberland Ankle Instability Tool (CAIT-C) and Foot and Ankle Ability Measure (FAAM-C) as inclusion criteria recommended by the International Ankle Consortium (IAC) for study of chronic ankle instability in the Chinese individuals.DesignCross-sectional comparative design with known groups.SettingResearch laboratory.Participants145 participants with chronic ankle instability (CAI) and 66 participants without injury.Main Outcome MeasuresCAIT-C and FAAM-C Activities of Daily Living (FAAM-C-ADL) and FAAM-C Sports (FAAM-C-Sports).ResultsThe CAIT-C scores (18.2 ± 5.6), FAAM-C-ADL scores (97.0 ± 4.3) and FAAM-C-Sports scores (92.2 ± 10.3) of the CAI group were all lower than the CAIT-C scores (27.4 ± 3.1), FAAM-ADL scores (99.0 ± 2.1) and FAAM-Sports scores (98.4 ± 3.1) (P < 0.01) of the uninjured group. The recommended cutoff score of CAIT-C<24 by the IAC for identifying CAI had a sensitivity of 80.7% and a specificity of 84.9%. If the recommended cutoff scores of FAAM-ADL<90，FAAM-Sports<80 by the IAC as inclusion criteria for the study of CAI were applied, 97% of participants with CAI in this sample would be excluded.ConclusionThe results support the recommended cutoff score of CAIT-C<24 by the IAC to identify Chinese individuals with CAI for study. However, the recommended cutoff scores of FAAM-ADL<90 and FAAM-Sports<80 will exclude most Chinese individuals with CAI having only mild functional impairments.Copyright © 2020 Elsevier Ltd. All rights reserved.

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