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A Reduced-Order Computational Model of a Semi-Active Variable-Stiffness Foot Prosthesis.

Michael A McGeehan1, Peter G Adamczyk2, Kieran M Nichols2

  • 1Department of Human Physiology, University of Oregon, 181 Esslinger Hall, 1525 University Street, Eugene, OR 97403.

Journal of Biomechanical Engineering
|March 11, 2021
PubMed
Summary

A new variable-stiffness foot (VSF) prosthesis simulation accurately models energy storage and return (ESR) properties. This validated model can predict ground reaction forces for optimizing prosthetic designs.

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Area of Science:

  • Biomechanics
  • Prosthetics Engineering
  • Computational Modeling

Background:

  • Passive energy storage and return (ESR) feet are standard in lower limb prostheses.
  • Semi-active variable-stiffness foot (VSF) prostheses offer adaptability beyond passive devices.

Purpose of the Study:

  • To model and simulate the energy storage and return (ESR) properties of a novel variable-stiffness foot (VSF) prosthesis.
  • To validate the simulation model against experimental data from static and dynamic conditions.

Main Methods:

  • Modeled VSF prosthesis ESR properties using a lumped parameter overhung beam with variable length.
  • Simulated foot-ground contact using sphere-to-plane models with optimized parameters.
  • Conducted simulations for static compression tests and dynamic gait, comparing outcomes to experimental data.

Main Results:

  • Model stiffness closely matched the physical VSF (R2: 0.98).
  • Predicted resultant ground reaction force (GRFR) showed good agreement with experimental data (R2: 0.90-0.98).
  • Anterior-posterior center of pressure predictions were highly accurate (R2 > 0.94).

Conclusions:

  • The developed model accurately simulates the ESR properties of the VSF prosthesis under various conditions.
  • This simulation methodology can predict GRFR for novel prostheses.
  • Validated simulation data aids in optimizing prosthetic design for individual users.