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Subtalar joint stability. Talocalcaneal interosseous ligament function studied in cadaver specimens
G A Knudson1, H B Kitaoka, C L Lu
1Department of Orthopedics, Mayo Clinic, Rochester, MN 55905, USA.
Acta Orthopaedica Scandinavica
|December 31, 1997
Summary
The talocalcaneal interosseous ligament (IOL) significantly stabilizes the subtalar joint, especially during supination. Its sectioning increased supination displacement, highlighting its crucial role in foot stability.
Area of Science:
- Orthopedics
- Biomechanics
- Anatomy
Background:
- The subtalar joint is crucial for foot function.
- Ligamentous structures provide essential stability to the subtalar joint.
- The specific contribution of the talocalcaneal interosseous ligament (IOL) to subtalar joint stability requires further elucidation.
Purpose of the Study:
- To quantify the contribution of the talocalcaneal interosseous ligament (IOL) to the stability of the subtalar (talocalcaneal) joint.
Main Methods:
- Utilized 6 fresh-frozen human foot specimens.
- Secured the tibia and ankle joint, applying circumferential bending and axial force to the calcaneus.
- Monitored calcaneal position relative to the talus using a magnetic tracking system before and after IOL sectioning.
Main Results:
- Intact subtalar joints exhibited two stable zones (supination and pronation) and two transition zones under loading.
- Sectioning the IOL resulted in significantly greater supination displacement (p = 0.008).
- No significant pronation displacement was observed after IOL sectioning.
Conclusions:
- The talocalcaneal interosseous ligament (IOL) plays a substantial role in maintaining subtalar joint stability.
- The IOL is particularly important for limiting supination displacement, contributing significantly to overall foot biomechanics.