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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: Jul 15, 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 stability deficits in subjects with self-reported ankle instability.

Erik A Wikstrom¹, Mark D Tillman, Terese L Chmielewski

¹Center for Exercise Science, University of Florida, Gainesville, FL 32611-8205, USA. ewikstrom@hhp.ufl.edu

Medicine and Science in Sports and Exercise

|May 3, 2007

Summary

A new dynamic postural stability index effectively differentiates individuals with functional ankle instability (FAI) from those with stable ankles. This reliable measure aids in assessing dynamic stability in FAI.

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Last Updated: Jul 15, 2026

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

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Computerized Dynamic Posturography for Postural Control Assessment in Patients with Intermittent Claudication

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Published on: December 11, 2013

Area of Science:

Biomechanics
Sports Medicine
Orthopedics

Background:

Functional ankle instability (FAI) presents challenges in assessing dynamic postural stability due to a lack of validated measures.
Understanding FAI's impact on dynamic stability is crucial for effective rehabilitation and injury prevention strategies.

Purpose of the Study:

To introduce and validate a novel dynamic postural stability index.
To determine if this new index can reliably differentiate between individuals with stable ankles and those with FAI.

Main Methods:

108 participants (54 with stable ankles, 54 with FAI) performed a single-leg-hop stabilization maneuver.
Data collected using a force plate, measuring dynamic postural stability and directional indices (medial/lateral, anterior/posterior, vertical).
Raw and normalized indices were compared between the stable and FAI groups.

Main Results:

Significant differences were observed in anterior/posterior and vertical stability indices between groups.
The normalized dynamic postural stability index and normalized vertical stability index also showed significant differences.
The dynamic postural stability index proved sensitive in detecting stability deficits.

Conclusions:

The developed dynamic postural stability index is a sensitive and valid tool.
This index can effectively distinguish between individuals with stable ankles and those with FAI.
The findings support the use of this index in clinical and research settings for FAI assessment.