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BMC Musculoskeletal Disorders
Published in: BMC Musculoskeletal Disorders 1/2020

Open Access 01-12-2020 | Research article

Characteristics and predictors of muscle strength deficit in mechanical ankle instability

Authors: Zong-chen Hou, Xin Miao, Ying-fang Ao, Yue-lin Hu, Chen Jiao, Qin-wei Guo, Xing Xie, Feng Zhao, Yan-bin Pi, Nan Li, Zhi-yu Zhang, Dong Jiang

Published in: BMC Musculoskeletal Disorders | Issue 1/2020

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Abstract

Purpose

Muscle strength training is a common strategy for treating chronic ankle instability (CAI), but the effectiveness decreases for mechanical ankle instability (MAI) patients with initial severe ligament injuries. The purpose of this study was to investigate the characteristics and the potential predictors of muscle strength deficit in MAI patients, with a view to proposing a more targeted muscle strength training strategy.

Methods

A total of 220 MAI patients with confirmed initial lateral ankle ligament rupture and a postinjury duration of more than 6 months were included. All patients underwent a Biodex isokinetic examination of the ankle joints of both the affected and unaffected sides. Then, the associations between the limb symmetry index (LSI) (mean peak torque of the injury side divided by that of the healthy side) and the patients’ sex, body mass index, postinjury duration, presence of intra-articular osteochondral lesions, presence of osteophytes and ligament injury pattern (i.e., isolated anterior talofibular ligament (ATFL) injury or combined with calcaneofibular ligament injury) were analysed.

Results

There was significantly weaker muscle strength on the affected side than on the unaffected side in all directions (p < 0.05). The LSI in plantar flexion was significantly lower than that in dorsiflexion at 60°/s (0.87 vs 0.98, p < 0.001). A lower LSI in eversion was significantly correlated with female sex (0.82 vs 0.94, p = 0.016) and isolated ATFL injury (0.86 vs 0.95, p = 0.012). No other factors were found to be associated with muscle strength deficits.

Conclusion

MAI patients showed significant muscle strength deficits on the affected side, especially in plantar flexion. There were greater strength deficits in eversion in females and individuals with an isolated ATFL injury. Thus, a muscle strength training programme for MAI patients was proposed that focused more on plantar flexion training and eversion training for females and those with an isolated ATFL injury.
Appendix
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Metadata
Title
Characteristics and predictors of muscle strength deficit in mechanical ankle instability
Authors
Zong-chen Hou
Xin Miao
Ying-fang Ao
Yue-lin Hu
Chen Jiao
Qin-wei Guo
Xing Xie
Feng Zhao
Yan-bin Pi
Nan Li
Zhi-yu Zhang
Dong Jiang
Publication date
01-12-2020
Publisher
BioMed Central
Published in
BMC Musculoskeletal Disorders / Issue 1/2020
Electronic ISSN: 1471-2474
DOI
https://doi.org/10.1186/s12891-020-03754-9

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