Document Type : Original article
Authors
1
Master of biomechanics, Department of physical education and sports sciences, Kharazmi University, Tehran, Iran
2
Full Professor of Sport Biomechanics, Department of Sport Biomechanics and Sport Injuries, Faculty of Physical Education and Sport Science, Kharazmi University, Tehran, Iran. Full Professor of Sport Biomechanics, Research Institute
3
3. Department of Sports Biomechanics and Injuries, Faculty of Physical Education and Sports Sciences, Birjand University, Birjand, Iran
10.22037/sjrm.2025.117434.3354
Abstract
Background and Aims: Chronic ankle instability (CAI) can lead to a significant reduction in quality of life. Investigating the force of the peroneus longus muscle can aid in identifying risk factors and improving treatment protocols. The objective of this study was to compare the force of the peroneus longus muscle during the initiation of walking between individuals with chronic ankle instability and healthy individuals using musculoskeletal modeling in the OpenSim software.
Materials and Methods: In this semi-experimental study, 19 patients with chronic ankle instability, each with a history of at least two sprains within the past 3 to 12 months, participated alongside 19 healthy athletes. The participants were placed on a force plate and began walking upon hearing an auditory cue. Using the gait2392 model in the OpenSim environment, the force of the peroneus longus muscle was calculated. Additionally, the initiation phase of walking and anticipatory postural adjustments were identified based on changes in the center of pressure and vertical components of the markers.
Results: Results indicated that the force of the peroneus longus (p=0.006) and the duration of anticipatory postural adjustments (p=0.002) were significantly lower in the CAI group compared to healthy individuals. Conversely, the CAI group exhibited significantly greater step length (p=0.001), step speed (p=0.001), and step time (p=0.04)
.Conclusion: Individuals with chronic ankle instability, due to a disturbance in proprioceptive receptors, experience weakness in the peroneus longus muscle. This weakness leads to a reduced ability to make anticipatory postural adjustments, resulting in individuals compensating for this deficiency by increasing their spatiotemporal gait variables.
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