Relationship Between Isokinetic Muscle Strength and Functional Tests in Chronic Ankle Instability

Young Hwan Park, Se Hyun Park, Soo Hyun Kim, Gi Won Choi, Hak Jun Kim

Research output: Contribution to journalArticle


Isokinetic muscle strength measurements and functional tests are usually performed to evaluate ankle condition in chronic ankle instability (CAI), yet there is no clear demonstration of the relationship between isokinetic muscle strength and functional tests. The objective of this study was to evaluate the relationship between isokinetic muscle strength and functional tests in CAI. Between April 2014 and August 2016, 103 patients with unilateral CAI were studied. Single-leg balance, single-heel raise, and single-leg squat tests were performed for static balancing assessment. Single-leg hop, double-leg jump, and sidestep tests were performed for dynamic balancing assessment. The isokinetic muscle strength of both ankles was measured using a dynamometer. The involved ankle showed lower muscle strength in inversion than the uninvolved ankle, while eversion, dorsiflexion, and plantarflexion muscle strength had no significant differences between ankles. There were significant correlations between the isokinetic muscle strength of inversion and the single-leg balance test, single-heel raise test, and sidestep test (Pearson's r; 0.246, 0.514, and 0.229 at 30°/second; 0.288, 0.473, and 0.239 at 180°/second, respectively). The single leg balance, single heel raise, and sidestep tests are useful to assess not only ankle functional performance but also isokinetic muscle strength. Among these tests, the single heel raise test was the most reliable test to reflect muscle strength deficiency in CAI.

Original languageEnglish
Pages (from-to)1187-1191
Number of pages5
JournalJournal of Foot and Ankle Surgery
Issue number6
Publication statusPublished - 2019 Nov



  • 3
  • ankle joint
  • chronic disease
  • exercise test
  • lateral ligament
  • muscle strength

ASJC Scopus subject areas

  • Surgery
  • Orthopedics and Sports Medicine

Cite this