Abstract

ABSTRACT An empirical consensus of differences between chronic ankle instability (CAI) individuals and copers (individuals who sprained ankle once and without recurrent symptoms or injury) has not been reported. This study aimed to review the locomotion biomechanics and dynamic postural control between these two populations. Database of ScienceDirect, PubMed and Web of Science was used to search (‘chronic ankle instability’ OR ‘ankle instability’) AND (‘ankle sprain’ OR ‘coper*’) until 30 November 2020. Articles that made a comparison about changes in biomechanical parameters between Copers and CAI individuals during locomotor or functional tasks were included in this review. Twenty-three articles met the inclusion criteria. CAI individuals exhibited an increased hip flexion to maintain stability, suggesting the adopted hip strategy compared to copers during landing. Dorsiflexion angle and ankle frontal displacement increased considerably compared to copers, which might increase risks of lateral ankle sprain injury. CAI individuals reduced the ankle displacements in the sagittal plane and indicated worse performance of Star Excursion Balance Test in the posterior-lateral direction compared to copers. Identified motion deficits or altered motion strategies provide opportunities for targeted intervention and scheme after index sprain or in CAI individuals.

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