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Related Experiment Videos

The unstable ankle mortise--functional ankle varus.

S W Bremer

    The Journal of Foot Surgery
    |September 1, 1985
    PubMed
    Summary

    A novel cause of lateral ankle instability involves triplane motion, a different ankle movement concept. Understanding this motion is key for diagnosing and treating functional ankle varus.

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    Clinical genetics·2003

    Area of Science:

    • Orthopedics
    • Biomechanics
    • Sports Medicine

    Background:

    • Lateral ankle instability is a common condition often resulting from ligamentous injury.
    • Existing models of ankle joint motion may not fully capture the complexities leading to instability.

    Purpose of the Study:

    • To introduce and describe a new etiology of lateral ankle instability.
    • To elucidate the concept of triplane motion at the ankle joint.
    • To highlight the clinical relevance of understanding triplane motion for evaluating functional ankle varus.

    Main Methods:

    • Conceptual analysis of ankle joint biomechanics.
    • Description of triplane motion in relation to plantarflexion and varus positioning.
    • Discussion of clinical implications for assessment and treatment.

    Main Results:

    • A new understanding of ankle joint motion, termed triplane motion, is presented.
    • Triplane motion inherently creates a varus position during plantarflexion.
    • This mechanism offers a new perspective on the etiology of lateral ankle instability.

    Conclusions:

    • Functional ankle varus can be a primary component of lateral ankle instability.
    • Proper assessment and treatment of functional ankle varus require understanding triplane motion.
    • This new concept provides a framework for addressing previously unexplained cases of ankle instability.

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