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Dynamic testing of below-knee prosthesis: assembly and components.

H W Wevers1, J P Durance

  • 1Department of Mechanical Engineering, Queen's University, Kingston, Ontario, Canada.

Prosthetics and Orthotics International
|December 1, 1987
PubMed
Summary
This summary is machine-generated.

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This study tested prosthetic lower limb socket durability using a gait simulation machine. HDPE sockets demonstrated resilience, enduring 400,000 cycles, while SACH feet showed vulnerability to wear and failure.

Area of Science:

  • Biomedical Engineering
  • Prosthetics and Orthotics
  • Materials Science

Background:

  • Lower limb prosthetic assemblies comprise multiple components, each susceptible to unique failure modes.
  • Understanding component durability is crucial for enhancing prosthetic device longevity and patient safety.

Purpose of the Study:

  • To dynamically test High-Density Polyethylene (HDPE) rotational molded prosthetic sockets under simulated gait conditions.
  • To evaluate the failure mechanisms and durability of prosthetic components, including sockets and SACH feet.

Main Methods:

  • Development of a specialized testing machine to replicate dynamic loadings experienced during normal human gait.
  • Subjecting prosthetic components to axial loading and anterior-posterior bending forces simulating knee and ankle movements.

Related Experiment Videos

  • Conducting cyclic testing up to 400,000 cycles to assess component lifespan and failure points.

    • Main Results:

    • SACH (Solid Ankle Cushion Heel) feet exhibited rapid wear and structural failures before 100,000 cycles.
    • HDPE sockets demonstrated significantly higher durability, withstanding simulated loads of 1350 N for approximately 400,000 cycles.
    • Potential fatigue failure in metal components, such as foot bolts, was noted if not adequately tightened.

    Conclusions:

    • HDPE rotational molded sockets offer superior durability compared to SACH feet under simulated gait loading.
    • The developed dynamic testing methodology effectively assesses prosthetic component performance and identifies vulnerabilities.
    • Adherence to proposed ISO standards is recommended for ensuring the reliability of prosthetic components.