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Related Experiment Videos

New techniques to establish the subtalar joint's functional axis

J L Morris1, L J Jones

  • 1Biomechanics Department, California College of Podiatric Medicine, San Francisco 94115.

Clinics in Podiatric Medicine and Surgery
|April 1, 1994
PubMed
Summary

A novel technique accurately determines the subtalar joint axis in live subjects, improving upon cadaver-based methods. This clinical tool aids surgical planning and orthotic evaluation for foot and ankle conditions.

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Area of Science:

  • Biomechanics
  • Orthopedics
  • Podiatry

Background:

  • Establishing the functional subtalar joint axis is crucial for understanding foot and ankle biomechanics.
  • Previous methods relied on cadaver models, lacking relevance to live function and body planes.
  • Loading and ground reactive forces influence the midtarsal joint and forefoot, affecting subtalar joint axis measurements.

Purpose of the Study:

  • To present a new, clinically applicable technique for determining the functional subtalar joint axis in live models.
  • To overcome limitations of previous methods that used cadaver bones and lacked proper body plane referencing.
  • To provide a reliable method for assessing axial alignment relevant to surgical interventions and orthotic management.

Main Methods:

  • Development of a technique to establish the functional subtalar joint axis in live subjects.

Related Experiment Videos

  • Application of the technique in a clinical setting using lateral radiographs of the calcaneal (RCSP).
  • Calculation of the actual subtalar joint axis relative to a reference line on the radiographs.

    • Main Results:

    • The functional subtalar joint axis was successfully determined in live models.
    • The calculated axis showed a small deviation (4 degrees) from the established reference line.
    • The calcaneal inclination angle can be used to correct for significant angular differences.

    Conclusions:

    • The presented technique offers a simple and effective method for determining the functional subtalar joint axis in a clinical setting.
    • This method provides valuable data for surgical planning and evaluating the efficacy of orthotic devices.
    • Accurate assessment of the subtalar joint axis can lead to improved patient outcomes in foot and ankle treatments.