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Can partial foot prostheses effectively restore foot length?

Michael P Dillon1, Timothy M Barker

  • 1Centre for Rehabilitation Science and Engineering, School of Mechanical, Manufacturing and Medical Engineering, Queensland University of Technology, Brisbane, Australia. michael.dillon@latrobe.edu.au

Prosthetics and Orthotics International
|June 3, 2006
PubMed
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Partial foot prostheses like toe fillers and slipper sockets fail to restore effective foot length in transmetatarsal and Lisfranc amputees. However, clamshell prostheses successfully restored effective foot length in Chopart amputees.

Area of Science:

  • Biomechanics
  • Prosthetics and Orthotics
  • Gait Analysis

Background:

  • Current understanding of partial foot prostheses relies on static analyses with potentially flawed assumptions about ground reaction forces.
  • Clinical observations suggest limitations in current prosthetic designs for partial foot amputations.

Purpose of the Study:

  • To evaluate if partial foot prostheses effectively restore the 'effective' foot length.
  • To analyze the functional differences between various types of partial foot prostheses.

Main Methods:

  • Collected Centre of Pressure (CoP) excursion data during gait analysis.
  • Utilized an Advanced Mechanical Technology Inc. force platform for precise measurements.
  • Compared CoP patterns in eight partial foot amputees with matched control subjects.

Related Experiment Videos

Main Results:

  • Toe fillers and slipper sockets did not restore effective foot length in transmetatarsal and Lisfranc amputees.
  • Clamshell prostheses successfully restored effective foot length in Chopart amputees.
  • Observed CoP patterns in transmetatarsal/Lisfranc amputees suggest gait adaptations to compensate for weak triceps surae and protect the distal stump.

Conclusions:

  • The rigidity and design of clamshell prostheses enable restoration of effective foot length and support external moments in Chopart amputees.
  • Toe fillers and slipper sockets may lack sufficient stiffness or appropriate design to aid weakened musculature and resist forefoot loading forces.
  • Partial foot prosthesis design significantly impacts functional restoration, with clamshell types showing promise for specific amputation levels.