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Related Concept Videos

Ankle Joint01:10

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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Method of Joints: Problem Solving II

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Updated: May 22, 2026

Treatment of Ankle Osteoarthritis with Total Ankle Replacement Through a Lateral Transfibular Approach
09:01

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Published on: January 24, 2018

Analytical decomposition can help to interpret ankle joint moment-angle relationship.

Ruoli Wang1, Eva W Broström, Anna-Clara Esbjörnsson

  • 1KTH Mechanics, Royal Institute of Technology, Stockholm, Sweden.

Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology
|May 11, 2012
PubMed
Summary

Dynamic joint stiffness in children was decomposed to understand gait. Component 1, related to ground reaction force moment, was dominant, offering insights into pathological gait differences in children with arthritis and toe-walking.

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Area of Science:

  • Biomechanics
  • Gait Analysis
  • Pediatric Orthopedics

Background:

  • The moment-angle relationship, or dynamic joint stiffness, is crucial for understanding gait biomechanics.
  • Limited understanding of individual contributors to dynamic joint stiffness hinders clinical applications.

Purpose of the Study:

  • To analyze and decompose ankle dynamic joint stiffness into components during the gait stance phase in children.
  • To investigate the clinical utility of this decomposition in pathological gait, specifically in children with juvenile idiopathic arthritis and idiopathic toe-walking.

Main Methods:

  • Decomposition of ankle dynamic joint stiffness into three components during the gait stance phase in 30 able-bodied children.
  • Validation of the decomposition method by comparing the sum of components to experimentally derived stiffness.
  • Retrospective analysis of gait data from children with juvenile idiopathic arthritis and idiopathic toe-walking.

Main Results:

  • The decomposition method showed good to very good agreement with experimental data.
  • Component 1, associated with ground reaction force moment changes, was the primary contributor to ankle dynamic joint stiffness.
  • Significant deviations in Component 1 were observed in pathological gait groups compared to controls, particularly in its sub-components related to ground reaction force and moment arm dynamics.

Conclusions:

  • Analytical decomposition effectively identifies individual contributors to dynamic joint stiffness.
  • This method clarifies the sources of gait differences in pediatric patient groups, showing potential for clinical application.
  • Component 1 sub-components are key indicators for differentiating pathological gait patterns.