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Related Experiment Videos

Static structural testing of trans-tibial composite sockets.

T A Current1, G F Kogler, D G Barth

  • 1Orthotics Prosthetics Section, Southern Illinois University School of Medicine, Springfield, Illinois 62794-9652, USA.

Prosthetics and Orthotics International
|September 24, 1999
PubMed
Summary
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This study evaluated trans-tibial composite sockets, finding no materials met ISO standards. Carbon reinforcements outperformed fiberglass, with unidirectional carbon showing the highest strength and strength-to-weight ratio.

Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Prosthetics and Orthotics

Background:

  • Established International Standards Organisation (ISO) standards exist for lower limb prostheses structural testing.
  • Specific ISO guidelines for trans-tibial socket structural testing are not yet established.
  • Trans-tibial sockets are critical components of lower limb prostheses, requiring robust structural integrity.

Purpose of the Study:

  • To quantify the structural strength of various trans-tibial composite sockets.
  • To develop loading parameters and methods emulating ISO standards for socket structural testing.
  • To identify material-dependent performance characteristics of composite trans-tibial sockets.

Main Methods:

  • Ten trans-tibial sockets were constructed using five reinforcement materials and two resin types.

Related Experiment Videos

  • A servo-hydraulic materials test machine was used to load sockets to failure at 100 N/s.
  • Experimental setup simulated maximum loading during the late stance phase of gait, adhering to ISO 10328 principles.

    • Main Results:

    • None of the tested composite sockets met the ISO 10328 standard for level A100 (4025 N).
    • All failures occurred at the pyramid attachment plate, indicating this as a critical stress point.
    • Reinforcement material type significantly influenced composite weight, strength-to-weight ratio, and ultimate strength.

    Conclusions:

    • Reinforcement material is the primary determinant of trans-tibial composite socket performance.
    • Carbon reinforcements demonstrated superior performance compared to fiberglass reinforcements.
    • Unidirectional carbon reinforcement yielded the highest ultimate strength and strength-to-weight ratio among tested materials.