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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 27, 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

Relationship between functional ankle instability and postural control.

Marcos de Noronha¹, Kathryn M Refshauge, Jack Crosbie

¹School of Physiotherapy, The University of Sydney, Australia. made6338@usyd.edu.au

The Journal of Orthopaedic and Sports Physical Therapy

|December 3, 2008

Summary

This summary is machine-generated.

Individuals with functional ankle instability exhibit impaired postural control, specifically in ankle inversion, after a hop-landing task. This suggests a need for targeted rehabilitation strategies to improve stability and prevent re-injury.

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Area of Science:

Biomechanics
Motor Control
Sports Medicine

Background:

Functional ankle instability (FAI) is a common condition following ankle sprains, often leading to recurrent episodes.
Impaired postural control is frequently reported in individuals with FAI, but its specific manifestation during dynamic tasks like hop-landing requires further investigation.

Purpose of the Study:

To examine the relationship between postural control and functional ankle instability during a hop-landing task.
To determine if postural control is altered in individuals with FAI compared to healthy controls.

Main Methods:

A controlled laboratory study with a cross-sectional design involving 60 participants.
Participants were categorized into a control group (Cumberland Ankle Instability Tool [CAIT] score ≥ 28) and an instability group (CAIT score ≤ 27).
Postural control was assessed using a hop-landing test measuring time to stability (TTS), electromyographic (EMG) activity, and movement kinematics.

Main Results:

No significant correlations were found between CAIT scores and TTS, EMG, or frontal plane movement.
Participants with FAI demonstrated longer TTS in inversion and greater pre-jump inversion variability compared to the control group (P = .05 and P = .009, respectively).

Conclusions:

Ankle inversion control is compromised in individuals with functional ankle instability during postural control tasks post-hop landing.
These findings highlight specific deficits in dynamic postural control that may contribute to recurrent ankle sprains.