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Related Experiment Videos

Development of a non-linear finite element modelling of the below-knee prosthetic socket interface

M Zhang1, M Lord, A R Turner-Smith

  • 1Department of Medical Engineering & Physics, King's College School of Medicine & Dentistry, Denmark Hill, London, UK.

Medical Engineering & Physics
|December 1, 1995
PubMed
Summary

A finite element model predicts below-knee amputee socket interface pressures and stresses. Friction significantly impacts these forces, with higher friction increasing shear stress but reducing pressure and slip.

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Area of Science:

  • Biomechanics
  • Biomedical Engineering
  • Prosthetics and Orthotics

Background:

  • Below-knee amputees experience challenges with residual limb socket fit.
  • Interface pressure and shear stress are critical factors affecting prosthetic comfort and function.
  • Understanding skin-liner interactions is essential for improving prosthetic socket design.

Purpose of the Study:

  • To develop and validate a non-linear finite element model of the limb-socket interface.
  • To predict pressure and shear stress distribution at the interface.
  • To investigate the influence of skin-liner friction and slip on interface mechanics.

Main Methods:

  • A non-linear finite element model was created using ABAQUS.
  • Limb tissue and socket liner were meshed into 3D elements.

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  • Interface elements (ABAQUS INTER4) were utilized to simulate friction.
  • Model was based on patient-specific limb and radiographic measurements.

    • Main Results:

    • Maximum interface pressure of 226 kPa and shear stress of 53 kPa were predicted under full body weight (800 N).
    • Less than 4 mm of slip was observed at the skin-liner interface.
    • The coefficient of friction was identified as a highly sensitive parameter.

    Conclusions:

    • The finite element model effectively predicts interface conditions in below-knee prosthetics.
    • Increased coefficient of friction leads to higher shear stress but lower pressure and slip.
    • Findings provide insights for optimizing prosthetic socket design and reducing discomfort.