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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: Jun 13, 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

Postural control differs between those with and without chronic ankle instability.

Erik A Wikstrom1, Kimberly A Fournier, Patrick O McKeon

  • 1Biodynamics Research Laboratory, Department of Kinesiology, University of North Carolina at Charlotte, Charlotte, NC 28223,United States. ewikstrom@uncc.edu

Gait & Posture
|April 27, 2010
PubMed
Summary
This summary is machine-generated.

Individuals with chronic ankle instability (CAI) exhibit greater center of pressure (COP) velocity and COP-center of mass (COP-COM) moment arm measures during single-leg stance compared to copers. These findings help differentiate between functional recovery and persistent instability after ankle sprains.

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Area of Science:

  • Biomechanics
  • Sports Medicine
  • Orthopedics

Background:

  • Lateral ankle sprains can lead to chronic ankle instability (CAI) or successful return to high-level activities (copers).
  • Understanding the biomechanical differences between copers and individuals with CAI is crucial for identifying mechanisms of instability.
  • Postural control deficits are suspected in CAI, but specific measures differentiating groups require further investigation.

Purpose of the Study:

  • To compare postural control using center of pressure (COP), time-to-boundary (TTB), and COP-center of mass (COP-COM) moment arm measures between controls, copers, and individuals with CAI.
  • To assess the diagnostic accuracy of these postural control measures in distinguishing between copers and individuals with CAI.

Main Methods:

  • 48 participants (16 controls, 16 copers, 16 CAI) performed 30-second single-leg stance trials on a force plate with eyes open.
  • Copers and CAI groups stood on their affected limb; controls stood on a matched limb.
  • Analysis included mediolateral and anteroposterior COP velocity, peak and mean COP-COM moment arms, and TTB measures.

Main Results:

  • Individuals with CAI demonstrated significantly greater mediolateral and anteroposterior COP velocity compared to both copers and controls (p<0.01).
  • The anteroposterior peak COP-COM moment arm and the resultant mean COP-COM moment arm were significantly larger in the CAI group compared to the coper group (p<0.01).
  • These specific COP-COM measures demonstrated high accuracy in discriminating between copers and individuals with CAI (p<0.05).

Conclusions:

  • Elevated COP velocity and COP-COM moment arm measures are indicative of impaired postural control in individuals with CAI.
  • These biomechanical parameters effectively differentiate individuals with CAI from those who successfully cope after ankle sprains.
  • Findings provide objective measures for assessing functional deficits and guiding rehabilitation strategies for chronic ankle instability.