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Related Experiment Videos

Development and testing of thermoplastic structural components for modular prostheses.

A G Coombes1, J MacCoughlan

  • 1Department of Mechanical Engineering, University College London, United Kingdom.

Prosthetics and Orthotics International
|April 1, 1988
PubMed
Summary
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Thermoplastic components offer advantages for artificial limbs, providing durability and shock absorption. Fatigue testing ensures structural integrity for long-term use in prosthetic devices.

Area of Science:

  • Biomaterials Engineering
  • Orthotics and Prosthetics

Background:

  • Thermoplastics offer advantages like low density, corrosion resistance, and mouldability for modular artificial limbs.
  • These materials present an alternative to traditional metal and carbon fiber reinforced systems.

Purpose of the Study:

  • To evaluate the suitability of rotationally molded Nylon 11 shank sections for prosthetic applications.
  • To assess the effectiveness of Philadelphia recommended load levels and fatigue testing for ensuring structural integrity.

Main Methods:

  • Development of Nylon 11 prosthetic shank sections using rotational molding.
  • Laboratory fatigue testing to evaluate structural deterioration due to creep.
  • Static load testing based on Philadelphia recommendations (2.5 kN).

Related Experiment Videos

  • 33-month patient trials of experimental prostheses.

    • Main Results:

    • Experimental prostheses with plastic shanks withstood high static loads and exceeded 2 million fatigue cycles.
    • Fatigue testing proved crucial for identifying creep-related deterioration, not apparent in static tests.
    • Philadelphia Static Load Level (2.5 kN) was validated as a relevant design criterion.

    Conclusions:

    • Thermoplastic prosthetic components, specifically Nylon 11 shanks, demonstrate satisfactory structural integrity and fatigue life for general service.
    • Combined static and fatigue testing provides a reliable criterion for evaluating thermoplastic prosthetic components for patient use.