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Published in: Knee Surgery, Sports Traumatology, Arthroscopy 1/2020

01-01-2020 | Ankle

Ankle strength is not strongly associated with postural stability in patients awaiting surgery for chronic lateral ankle instability

Authors: Kyung Rae Ko, Hyobeom Lee, Won-Young Lee, Ki-Sun Sung

Published in: Knee Surgery, Sports Traumatology, Arthroscopy | Issue 1/2020

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Abstract

Purpose

(1) To describe ankle strength and postural stability in patients with chronic lateral ankle instability and (2) to analyse the correlation between deficits in ankle strength and postural stability.

Methods

Results of preoperative isokinetic and balance tests in 203 patients whose contralateral ankle was normal were retrospectively reviewed. Isokinetic peak torque values of eversion and inversion at 2 angular velocities (30°/s and 120°/s) were measured in the injured and normal ankles. In the balance test, the percent differences of 3 actual scores (overall, anterior–posterior, and medial–lateral) between the injured and normal ankles were calculated. Additional statistical analyses were performed to evaluate weakness of ankle strength, postural stability deficits, and their correlation.

Results

Significant differences in 4 peak torque values and 4 relative peak torque values (peak torque/body weight) were found between the injured and normal ankles. All 8 values were significantly lower in the injured ankles. Weakness was severe during inversion and at 30°/s. In the balance test, 49 subjects (24.1%) had significant deficits in postural stability and 109 (53.7%) had favourable results. No strong association was found between weakness of ankle strength and deficits in postural stability.

Conclusions

Strength measurement alone is insufficient to evaluate preoperative functional deficits, and other functional tests are required to measure postural stability. The results of this study provide further evidence for a rehabilitation programme consisting of proprioceptive training as well as strengthening. The proprioceptive training must be an integral part of the rehabilitation programme in addition to strengthening exercise.

Level of evidence

Case series, Level IV.
Appendix
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Metadata
Title
Ankle strength is not strongly associated with postural stability in patients awaiting surgery for chronic lateral ankle instability
Authors
Kyung Rae Ko
Hyobeom Lee
Won-Young Lee
Ki-Sun Sung
Publication date
01-01-2020
Publisher
Springer Berlin Heidelberg
Published in
Knee Surgery, Sports Traumatology, Arthroscopy / Issue 1/2020
Print ISSN: 0942-2056
Electronic ISSN: 1433-7347
DOI
https://doi.org/10.1007/s00167-018-4960-0

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