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Related Experiment Videos

A dynamic study of the ankle-foot complex.

C L Wang1, Y S Hang, T K Liu

  • 1Department of Orthopedic Surgery, College of Medicine, National Taiwan University, Taipei, R.O.C.

Journal of the Formosan Medical Association = Taiwan Yi Zhi
|April 1, 1992
PubMed
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This study reveals how ankle and foot bones move differently during walking. Understanding these complex movements, like calcaneus eversion and inversion, is key for analyzing gait biomechanics.

Area of Science:

  • Biomechanics
  • Orthopedics
  • Human Movement Science

Background:

  • The ankle-foot complex is crucial for locomotion.
  • Understanding its intricate movements, especially during weight-bearing activities, is essential for diagnosing and treating foot and ankle pathologies.

Purpose of the Study:

  • To investigate the three-dimensional kinematics of the ankle-foot complex.
  • To differentiate between open and closed kinetic chain movements of the ankle.
  • To analyze the excursions of the talus, calcaneus, and navicular bones during ankle motion.

Main Methods:

  • A kinematic study involving 19 healthy volunteers.
  • Utilized computerized radiocinematography for precise motion capture.
  • Analyzed ankle-foot complex movements under both non-weight-bearing (open kinetic chain) and weight-bearing (closed kinetic chain) conditions.

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Main Results:

  • Instant centers of rotation for the ankle joint were located within the talus in the sagittal plane.
  • The talus, calcaneus, and navicular bones exhibited distinct excursions during ankle motion.
  • In open kinetic chain movements, the calcaneus showed eversion during dorsiflexion and inversion during plantar flexion.
  • In closed kinetic chain movements, dorsiflexion of the ankle resulted in internal rotation of the lower leg and plantarward talar movement, which translated to calcaneal eversion in the frontal plane.

Conclusions:

  • The ankle-foot complex exhibits complex, coupled movements that differ significantly between open and closed kinetic chain conditions.
  • Calcaneal motion (eversion/inversion) is intrinsically linked to ankle dorsiflexion/plantar flexion, especially under weight-bearing conditions.
  • These findings provide valuable insights into the biomechanics of the ankle-foot complex, relevant for clinical applications in gait analysis and rehabilitation.