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Related Experiment Videos

An anatomic study of subtalar instability.

A E Heilman1, W G Braly, J O Bishop

  • 1Division of Orthopedic Surgery, Baylor College of Medicine, Houston, TX 77030.

Foot & Ankle
|February 1, 1990
PubMed
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Subtalar instability results from damage to specific ankle ligaments. Repairing the calcaneofibular ligament is crucial for treating lateral ankle instability when subtalar joint issues are present.

Area of Science:

  • Orthopedic Surgery
  • Anatomy
  • Biomechanics

Background:

  • Subtalar instability is a recognized cause of ankle symptoms.
  • Understanding ligamentous injury is key to diagnosing and treating subtalar instability.

Purpose of the Study:

  • To identify the specific ligament damage causing subtalar instability.
  • To establish a radiographic method for demonstrating subtalar joint opening.

Main Methods:

  • Dissection of ten fresh adult cadaver ankles.
  • Selective sectioning of calcaneofibular ligament, capsule, and interosseous ligaments.
  • Radiographic assessment of subtalar joint opening using lateral and Brodan's views.

Main Results:

  • Sectioning the calcaneofibular ligament alone caused a 5-mm subtalar joint opening.

Related Experiment Videos

  • Combined sectioning of calcaneofibular and interosseous ligaments resulted in a 7-mm opening.
  • Ankle instability (talar tilting) occurred only with additional anterior talofibular ligament damage.

    • Conclusions:

    • The calcaneofibular ligament plays a significant role in subtalar stability.
    • Surgical correction for lateral ankle instability should consider calcaneofibular ligament repair/substitution if subtalar instability is suspected.