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Related Experiment Videos

Interface shear stresses during ambulation with a below-knee prosthetic limb.

J E Sanders1, C H Daly, E M Burgess

  • 1Center for Bioengineering, University of Washington, Seattle 98195.

Journal of Rehabilitation Research and Development
|January 1, 1992
PubMed
Summary

Shear stresses in prosthetic sockets can damage skin for below-knee amputees. Understanding these forces during walking is key to improving prosthetic socket design and preventing tissue breakdown.

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Area of Science:

  • Biomechanics
  • Biomedical Engineering
  • Prosthetics

Background:

  • Shear stresses within prosthetic sockets are a known factor in residual limb tissue breakdown for below-knee amputees.
  • Simultaneous normal and shear stresses can lead to skin injury or surface abrasion.

Purpose of the Study:

  • To investigate shear stresses and influencing parameters in prosthetic sockets.
  • To provide insight into the mechanical interactions between the residual limb and the prosthetic socket during ambulation.

Main Methods:

  • Interface stresses were measured on below-knee amputee subjects during walking trials.
  • Quantitative data on shear stress magnitudes and directions were collected.

Main Results:

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  • Resultant shear forces ranged from 5.0 kPa to 40.7 kPa across different socket locations (tibial flares and posterior surface).
  • Shear stress direction varied during the stance phase, with anterior shears directed apically and posterior shears directed downwards.
  • Shear stress waveforms typically exhibited two peaks within the stance phase.

    • Conclusions:

    • The study quantifies shear stress magnitudes and patterns during walking in below-knee amputees.
    • Findings offer valuable data for enhancing residual limb tissue mechanics models.
    • Results can inform improved prosthetic socket design to mitigate tissue damage.