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Related Concept Videos

Ankle Joint01:10

Ankle Joint

The ankle is formed by the talocrural joint (crural = leg). It consists of the articulations between the talus bone of the foot and the distal ends of the tibia and fibula of the leg. The superior aspect of the talus bone is square-shaped and has three areas of articulation. The top of the talus articulates with the inferior tibia. This is the portion of the ankle joint that carries the body weight between the leg and foot. The sides of the talus are firmly held in position by the articulations...

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Related Experiment Video

Updated: Jul 12, 2026

Evaluating Postural Control and Lower-extremity Muscle Activation in Individuals with Chronic Ankle Instability
07:52

Evaluating Postural Control and Lower-extremity Muscle Activation in Individuals with Chronic Ankle Instability

Published on: September 18, 2020

Reduced Effective Postural Responses to External Perturbations in Chronic Ankle Instability.

Xiaohan Xu1, Joanna Bowtell1, William R Young1

  • 1Public Health and Sports Sciences Department, University of Exeter, Exeter, UK.

Scandinavian Journal of Medicine & Science in Sports
|July 10, 2026
PubMed
Summary

Individuals with chronic ankle instability (CAI) exhibit poorer postural control during sudden balance challenges. Their joint actions are less effective in maintaining stability compared to healthy individuals.

Keywords:
chronic ankle instabilityjoint torquesmargin of stabilityperturbationpostural control

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Area of Science:

  • Biomechanics
  • Motor Control
  • Sports Medicine

Background:

  • Chronic ankle instability (CAI) is linked to postural control deficits, especially during dynamic movements and external disturbances.
  • The precise nature of postural stability and joint actions in CAI during such events requires further clarification.

Purpose of the Study:

  • To investigate differences in postural responses to mediolateral platform perturbations during single-leg stance in individuals with CAI versus healthy controls (HC).
  • To identify how joint torques contribute to postural stability in CAI during perturbed balance.

Main Methods:

  • Twenty-three CAI participants and 23 HC participants underwent a single-leg stance balance task with a 1-second mediolateral platform perturbation.
  • Ground reaction forces and kinematic data were collected to calculate the margin of stability (MoS) and frontal plane joint torques.

Main Results:

  • The CAI group demonstrated a significantly increased MoS during platform movement changes and after the platform stopped compared to the HC group (p<0.05).
  • A weaker correlation between MoS and hip/trunk torque was observed in the CAI group, indicating less effective joint action for postural control.
  • Sudden changes in the base of support effectively identified postural impairments in CAI.

Conclusions:

  • Individuals with CAI exhibit a less stable postural strategy and reduced effectiveness of joint actions during perturbed single-leg stance.
  • Dynamic balance tasks involving sudden base of support alterations are valuable for detecting postural deficits in CAI.
  • Further research should explore potential interventions to improve these identified postural impairments in CAI.