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Evaluation of Muscle Activity and Foot Pressure during Gait, and Isokinetic Strength and Balance in Persons with Functional Ankle Instability
J Korean Soc Phys Med 2018;13(3):27-37
Published online August 31, 2018;
© 2018 Journal of The Korean Society of Physical Medicine.

Sun-Ah Lee, MSc⋅Ah-Ram Kim, PhD, PT1⋅Kyung-Tae Yoo, PhD, PT1⋅Ho-Seong Lee, PhD

Department of Kinesiologic Medical Science, Graduate, Dankook University
1Department of Physical Therapy, Namseoul University
Received May 31, 2018; Revised June 7, 2018; Accepted June 29, 2018.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
PURPOSE: The purpose of this study was to investigate and evaluate muscle activity and foot pressure during gait, and isokinetic strength and balance in persons with functional ankle instability (FAI).
METHODS: Nine healthy subjects (CON, n=9) without FAI and 11 patients (FAI, n=11) with FAI participated in the study after having been screened with an ankle instability instrument and a balance error scoring system. In addition, FAI was classified as non-involved (FAI-N) or involved (FAI-I), and CON was classified as dominant or non-dominant. All subjects were evaluated for isokinetic strength (plantar flexion, dorsiflexion, inversion and eversion of 30°/sec and 60°/sec), balance (static and dynamic), muscle activity (tibialis anterior, peroneus longus and gastrocnemius) and foot pressure (static and dynamic) during gait.
RESULTS: Results showed that plantar flexion (p<.05), dorsiflexion (p<.05), inversion (p<.01) and eversion (p<.00) of 60°/sec were significantly decreased in FAI-I compared to those in FAI-N and CON. C 90 of static balance with eyes open (p<.01) and closed (p<.00) were significantly increased in FAI compared to those in CON. Forward position of dynamic balance (p<.01) was significantly decreased in FAI compared to that in CON. Gastrocnemius and peroneus longus of dynamic muscle activity (p<.01), left and right weight distribution of static foot pressure (p<.00) and pressure distribution of dynamic foot pressure (p<.00) were significantly decreased in FAI-I compared to those in FAI-N.
CONCLUSION: We demonstrated that ankle strength, balance, muscle activity and foot pressure were significantly correlated with FAI.
Keywords : Balance, Foot pressure, Functional ankle instability, Isokinetic strength, Muscle activity

August 2018, 13 (3)
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