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Related Experiment Videos

Distal fibular length needed for ankle stability.

Eiichi Uchiyama1, Daisuke Suzuki, Hideji Kura

  • 1Anatomy, Sapporo Medical University, South 1, West 17, Chuo-ku, Sapporo, Hokkaido 060-8556, Japan. uchiyama@sapmed.ac.jp

Foot & Ankle International
|March 17, 2006
PubMed
Summary

Resecting the fibula significantly increases ankle inversion and rotation, especially with distal cuts. Surgeons should consider syndesmosis fixation or bracing when shortening the distal fibula by 6 cm or more to maintain ankle stability.

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Area of Science:

  • Orthopedic Surgery
  • Biomechanics
  • Anatomy

Background:

  • The fibula is a common source for bone grafts.
  • Distal fibula length impacts long-term ankle stability.
  • Clear guidelines for safe fibula bone harvesting are lacking.

Purpose of the Study:

  • To investigate the biomechanical effect of fibula resection on ankle joint stability.
  • To determine safe limits for fibula bone harvesting.

Main Methods:

  • Six fresh-frozen cadaver legs were used.
  • The fibula was sequentially resected at proximal and distal points.
  • Tibia, talus, and calcaneus motion was measured under applied forces.

Main Results:

Related Experiment Videos

  • Fibula resection increased ankle inversion angles.
  • A distal 4-cm fibula resection significantly increased inversion (57.6 to 67.4 degrees).
  • Distal resection also notably increased rotational angles (11.3 to 78.7 degrees).

    • Conclusions:

    • The entire fibula, including the head, is crucial for ankle stability.
    • The distal fibula stabilizes the ankle mortise during inversion and external rotation.
    • Fixation or bracing is recommended for distal fibula shortening of 6 cm or more to prevent instability.