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Ankle Joint

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 24, 2026

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

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

Published on: September 18, 2020

Sensorimotor function as a predictor of chronic ankle instability.

JoEllen M Sefton¹, Charlie A Hicks-Little, Tricia J Hubbard

¹Department of Kinesiology, Auburn University, Auburn, AL 36849-5323, USA. jmsefton@auburn.edu

Clinical Biomechanics (Bristol, Avon)

|April 7, 2009

Summary

This summary is machine-generated.

Chronic ankle instability is often linked to sensorimotor deficits. Static balance and motoneuron pool excitability measures accurately identify unstable ankles, guiding rehabilitation strategies.

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Area of Science:

Biomechanics
Neurology
Sports Medicine

Background:

Recurrent ankle injuries affect 70% of individuals post-lateral ankle sprain.
The underlying causes of high recurrence rates remain unclear.
Sensorimotor deficits are investigated as a potential factor, but research findings are inconsistent.

Purpose of the Study:

To investigate the role of sensorimotor deficits in chronic ankle instability.
To identify specific measures that effectively differentiate between chronically unstable and healthy ankles.

Main Methods:

Twenty-two individuals with chronic ankle instability and 21 healthy controls participated.
Twenty-five sensorimotor variables were measured, including joint kinesthesia, static balance, dynamic balance, and motoneuron pool excitability.
Discriminant function analysis was employed to evaluate the variables.

Main Results:

A discriminant function analysis revealed significant differences between groups (Wilks' Lambda=0.536, P=0.002).
Seven variables, specifically from static balance and motoneuron pool excitability, accurately classified over 86% of participants with unstable ankles.
Key discriminating variables included anterior/posterior and medial/lateral displacement/velocity for static balance, and measures of recurrent inhibition and paired reflex depression for motoneuron pool excitability.

Conclusions:

A multivariate approach is likely essential for understanding sensorimotor function in chronic ankle instability.
Static balance and motoneuron pool excitability measures were most effective in classifying individuals with chronic ankle instability.
These findings suggest that static balance and motoneuron pool excitability may hold greater clinical significance for rehabilitation and prevention programs compared to dynamic balance or joint kinesthesia.