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Running-specific prosthesis' performance characterization by dynamic finite element approach.

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Running-specific prostheses (RSP) stiffness and performance decrease with increased running speed. J-curve RSP offer higher stiffness and energy storage, while C-curve RSP improve energy efficiency and contact time for amputee athletes.

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Area of Science:

  • Biomechanics
  • Prosthetics Engineering
  • Sports Science

Background:

  • Running-specific prostheses (RSP) mimic biological legs for amputee athletes.
  • The biomechanical impact of RSPs on transtibial amputees is not fully understood.

Purpose of the Study:

  • To develop a finite element model to evaluate RSP performance.
  • To analyze the influence of running speed and RSP geometry on stiffness and energy efficiency.

Main Methods:

  • A time-dependent finite element model was created.
  • The model incorporated dynamic loads and angles during ground contact.
  • In-silico characterization considered RSP intrinsic properties and athlete biomechanics.

Main Results:

  • Increased running speed reduced RSP stiffness, vertical ground reaction force (vGRF), and contact time.
  • RSP force-displacement profiles were nonlinear but linearizable at high speeds.
  • Higher RSPs decreased energy efficiency and vGRF due to lower stiffness.

Conclusions:

  • J-curve RSPs demonstrated higher stiffness, vGRF, and strain energy.
  • C-curve RSPs resulted in longer contact times and enhanced energy efficiency.
  • RSP design significantly influences amputee running biomechanics and performance.