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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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The tibia is the main weight-bearing bone of the lower leg. It is larger than the fibula with which it is paired. The tibia is also the second longest bone in the body and is located right below the skin. The proximal end of the tibia forms the medial and the lateral condyle, which articulates with the condyles of the femur to form the knee joint. Between the articulating surfaces is the irregular elevated area known as the intercondylar eminence that serves as the inferior attachment point for...

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Related Experiment Video

Updated: Jun 30, 2026

A Mouse Model of Ankle-Subtalar Complex Joint Instability

A Mouse Model of Ankle-Subtalar Complex Joint Instability

Published on: October 28, 2022

Effect of the AirStirrup in Controlling Ankle Inversion Stress.

I F Kimura, D A Nawoczenski, M Epler

The Journal of Orthopaedic and Sports Physical Therapy

|January 1, 1987

Summary

Ankle braces significantly reduce subtalar joint inversion, a key factor in ankle sprains. This study demonstrates the effectiveness of the AirStirrup in limiting excessive ankle motion during inversion stress.

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Last Updated: Jun 30, 2026

A Mouse Model of Ankle-Subtalar Complex Joint Instability

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Experimental Methods to Study Human Postural Control

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Published on: September 11, 2019

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

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Published on: September 18, 2020

Area of Science:

Biomechanics of the lower extremity
Sports medicine and injury prevention

Background:

Subtalar joint inversion is a primary mechanism of ankle sprains.
Ankle braces are commonly used to prevent ankle injuries.

Purpose of the Study:

To quantify the effect of the AirStirrup brace on subtalar joint inversion.
To evaluate the efficacy of ankle bracing in limiting excessive inversion during a controlled stress test.

Main Methods:

High-speed cinematography and a specialized inversion platform were used to measure ankle motion.
Eighteen healthy subjects underwent controlled inversion stress with and without AirStirrup application.
Kinematic data of marked anatomical points were digitized and analyzed to calculate maximum subtalar inversion angles.

Main Results:

A statistically significant reduction (p < 0.001) in subtalar joint inversion was observed when the AirStirrup was applied.
The unbraced ankle exhibited a greater range of inversion compared to the braced ankle.

Conclusions:

The AirStirrup ankle brace effectively limits subtalar joint inversion.
This bracing mechanism may play a crucial role in preventing inversion ankle injuries in athletic populations.