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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 23, 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

Dynamic postural control but not mechanical stability differs among those with and without chronic ankle instability.

E A Wikstrom¹, M D Tillman, T L Chmielewski

¹Biodynamics Research Laboratory, Department of Kinesiology, University of North Carolina at Charlotte, Charlotte, North Carolina 28223, USA. ewikstrom@uncc.edu

Scandinavian Journal of Medicine & Science in Sports

|May 9, 2009

Summary

Individuals with chronic ankle instability (CAI) exhibit altered dynamic postural control and increased ankle joint stiffness. However, those with prior ankle injuries but no CAI show enhanced frontal plane stability, potentially a protective mechanism.

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Area of Science:

Biomechanics
Sports Medicine
Orthopedics

Background:

Chronic ankle instability (CAI) is a common sequela of acute ankle sprains.
Understanding the interplay between dynamic postural control and mechanical ankle stability is crucial for managing CAI.
Previous ankle injuries can lead to altered sensorimotor function and joint mechanics.

Purpose of the Study:

To compare dynamic postural control and mechanical ankle stability in individuals with and without CAI, and healthy controls.
To investigate potential compensatory mechanisms in individuals with a history of ankle injury.

Main Methods:

Seventy-two participants were divided into three groups: uninjured controls, individuals with previous ankle injury without CAI, and individuals with CAI.
Dynamic postural stability was assessed using a single-leg hop-stabilization task.
Mechanical ankle stability was evaluated via the anterior drawer test for ankle joint stiffness and lateral ankle radiography for fibula position.

Main Results:

Individuals with previous ankle injuries but without CAI demonstrated superior frontal plane dynamic postural stability compared to controls and the CAI group.
Both CAI and non-CAI injured groups exhibited significantly higher sagittal plane dynamic postural stability and increased ankle joint stiffness than controls.
Mechanical stability alterations, such as changes in fibula position, are associated with initial ankle trauma.

Conclusions:

Enhanced frontal plane dynamic postural control may serve as a compensatory strategy to prevent recurrent ankle sprains and the development of CAI.
Increased ankle joint stiffness and altered dynamic postural control are characteristic of both CAI and individuals with a history of ankle injury.
Mechanical instability likely originates from the initial traumatic ankle event.