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Related Experiment Video

Updated: May 19, 2026

Oscillation and Reaction Board Techniques for Estimating Inertial Properties of a Below-knee Prosthesis
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Mechanisms to absorb load in amputee running.

Siobhan C Strike1, Oliver Wickett, Marlene Schoeman

  • 1Roehampton University, Whitelands College, Roehampton, UK. s.strike@roehampton.ac.uk

Prosthetics and Orthotics International
|August 25, 2012
PubMed
Summary

A shock absorbing pylon (SAP) had minimal and inconsistent effects on ground reaction forces and shock absorption mechanisms during running in transtibial amputees. The prosthetic condition did not systematically alter key loading phase variables.

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Area of Science:

  • Biomechanics
  • Prosthetics
  • Gait Analysis

Background:

  • Running involves significant impact forces transmitted through the prosthetic limb.
  • Understanding shock absorption mechanisms is crucial for optimizing prosthetic design and user outcomes.
  • Shock absorbing pylons (SAP) are designed to mitigate impact forces during locomotion.

Purpose of the Study:

  • To compare the effects of a shock absorbing pylon (SAP) versus a rigid pylon (Rigid) on ground reaction force (GRF) characteristics.
  • To investigate the influence of SAP on shock absorbing mechanisms during the loading phase of running.
  • To determine if prosthetic pylon type impacts loading phase mechanics in transtibial amputees.

Main Methods:

  • A within-participant study design was employed with five male transtibial amputees.

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  • Participants ran under two prosthetic conditions: shock absorbing pylon (SAP) and rigid pylon (Rigid).
  • Kinematic and kinetic data, including GRF, were collected to analyze loading phase mechanics.

    • Main Results:

    • No systematic differences were observed in loading rate, peak vertical/horizontal GRF, or time to these measures between SAP and Rigid conditions.
    • Knee and hip angular displacement, absorbing power, and work done were not significantly affected by the prosthetic condition.
    • Individual responses to the SAP varied, with some participants showing increased and others decreased values for tested variables.

    Conclusions:

    • The shock absorbing pylon (SAP) demonstrated minimal and inconsistent effects on the loading phase mechanics during running.
    • The tested SAP did not provide a consistent benefit in reducing impact forces or enhancing shock absorption across all participants.
    • Further research may be needed to explore different SAP designs or patient populations to optimize prosthetic shock absorption.