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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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A Mouse Model of Ankle-Subtalar Complex Joint Instability

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Chronic ankle instability affects the association between knee joint angle and loading: musculoskeletal simulation

Hoon Kim^1,2, Kristof Kipp³

¹Department of Sports Medicine, Soonchunhyang University, Asan, South Korea.

Computer Methods in Biomechanics and Biomedical Engineering

|March 12, 2024

Summary

People with chronic ankle instability (CAI) lack a key knee load-angle association seen in healthy individuals. This difference may heighten knee injury risk in CAI patients.

Keywords:

Knee contact force chronic ankle instability knee osteoarthritis modeling simulation

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Area of Science:

Biomechanics
Orthopedics
Sports Medicine

Background:

Chronic ankle instability (CAI) is prevalent and often associated with secondary knee issues.
Understanding altered joint loading mechanics in CAI is crucial for injury prevention.

Purpose of the Study:

To compare knee loads, muscle contributions, and knee flexion angle effects during jump-landing between CAI patients and healthy controls.
To investigate how CAI influences the relationship between knee joint loading and joint kinematics.

Main Methods:

Utilized 3D kinematics, ground reaction forces, and electromyography during a forward jump-landing task.
Applied musculoskeletal modeling to quantify joint loads and muscle-specific contributions.
Included eight CAI patients and seven healthy controls.

Main Results:

Healthy controls showed a significant association between knee flexion angle and knee compressive impulse (r=0.854, p=0.014).
This association was absent in the CAI group.
Muscle-specific load contributions were also analyzed, though not detailed in the abstract.

Conclusions:

The absence of a knee flexion angle-knee load relationship in CAI may indicate altered neuromuscular control.
This biomechanical difference could contribute to knee instability and increase the risk of knee injuries in individuals with CAI.