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Influence of Step-Width Manipulation on Running Biomechanics

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Designing Custom Mechanics in Running-Specific Prosthetic Feet via Shape Optimization.

Max K Shepherd, Daniel Gunz, Tyler Clites

IEEE Transactions on Bio-Medical Engineering

|August 26, 2022

Summary

Researchers developed a shape optimization tool to design custom running prosthetics. This tool allows for tailored foot mechanics, potentially improving athlete biomechanics and performance.

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Area of Science:

Biomechanics
Prosthetics Design
Computational Mechanics

Background:

Running prosthetics are specialized curved springs storing elastic energy.
Current design methods are limited by complex geometric constraints.

Purpose of the Study:

To introduce a shape optimization tool for designing running prosthetics with desired mechanics.
To generate and validate new prosthetic foot shapes.

Main Methods:

Developed two formulations for prosthetic foot mechanics.
Utilized custom spline-based shape optimization.
Designed and characterized three running prosthetics with varied horizontal deflections.
Compared prosthetics' endpoint mechanics and biomechanics in an amputee athlete.

Main Results:

Shape optimization successfully derived shapes altering prosthesis mechanics.
Benchtop testing validated the performance of two newly designed feet.
Subject's knee moments increased with horizontal endpoint deflection as predicted.

Conclusions:

A validated shape optimization tool was developed for achieving desired running prosthetic mechanics.
This framework can help researchers understand the relationship between prosthetic mechanics and athlete performance.