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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 6, 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

Assessment tools for identifying functional limitations associated with functional ankle instability.

Scott E Ross¹, Kevin M Guskiewicz, Michael T Gross

¹Virginia Commonwealth University, Richmond, VA 23284-2020, USA. seross@vcu.edu

Journal of Athletic Training

|March 13, 2008

Summary

This summary is machine-generated.

The Ankle Joint Functional Assessment Tool (AJFAT) accurately identifies functional ankle instability (FAI). This questionnaire is superior to the single-leg jump landing test for distinguishing between unstable and stable ankles.

Keywords:

Ankle Joint Functional Assessment Tool ankle sprains balance time to stabilization

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Area of Science:

Biomechanics
Orthopedics
Sports Medicine

Background:

Functional ankle instability (FAI) presents challenges in differentiating between unstable and stable ankles.
Effective assessment tools are crucial for identifying functional limitations in individuals with FAI.

Purpose of the Study:

To identify assessment tools capable of discriminating FAI from stable ankles.
To determine the most accurate tool for this discrimination.

Main Methods:

A case-control study was conducted in a research laboratory setting.
Fifteen individuals with FAI and 15 healthy controls participated.
Participants completed the Ankle Joint Functional Assessment Tool (AJFAT) and performed a single-leg jump landing task.

Main Results:

The AJFAT demonstrated excellent discrimination with a cutoff score of >=26 (sensitivity=1, specificity=1) and an area under the curve (AUC) of 1.0.
The single-leg jump landing's time to stabilization showed fair discrimination (AUC=0.72).
The AJFAT significantly outperformed the jump landing test in accuracy.

Conclusions:

The AJFAT is an excellent tool for discriminating between FAI and stable ankles.
Time to stabilization after a jump landing is a fair, but less accurate, assessment tool.
Further validation with prospective studies is recommended.