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Related Experiment Video

Updated: Dec 9, 2025

Engineering Platform and Experimental Protocol for Design and Evaluation of a Neurally-controlled Powered Transfemoral Prosthesis
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Human-prosthesis coordination: A preliminary study exploring coordination with a powered ankle-foot prosthesis.

Bretta L Fylstra1, I-Chieh Lee1, Stephanie Huang1

  • 1Joint Department of Biomedical Engineering, North Carolina State University and University of North Carolina at Chapel Hill, Raleigh, NC 27606, USA.

Clinical Biomechanics (Bristol, Avon)
|September 15, 2020
PubMed
Summary
This summary is machine-generated.

Powered ankle-foot prostheses did not consistently improve gait efficiency. Poor coordination between the amputee and the powered prosthesis, indicated by early propulsion timing and shank posture, was observed in some participants.

Keywords:
Human-prosthesis interactionHuman-prosthesis interfacePowered ankle-foot prosthesisTranstibial amputee

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Area of Science:

  • Biomechanics
  • Prosthetics
  • Gait Analysis

Background:

  • Powered ankle-foot prostheses aim to mimic biological ankle function by generating positive work during push-off.
  • However, consistent improvements in overall gait efficiency (metabolic cost) with powered prostheses remain unproven.
  • This study investigates the mechanical work at the prosthetic ankle and its interaction with amputee movement.

Purpose of the Study:

  • To evaluate the net ankle work and human-prosthesis interaction efficiency.
  • To assess coordination between amputee limb movement and prosthetic control during gait.
  • To compare powered vs. passive prosthetic devices in unilateral transtibial amputees.

Main Methods:

  • Five unilateral transtibial amputees participated in treadmill walking trials.
  • Comparison between a powered ankle-foot prosthesis and a daily passive device.
  • Analysis of net ankle work, ankle work loops, peak propulsion timing, and lower limb/prosthesis posture.

Main Results:

  • The powered prosthesis did not consistently enhance net ankle work over the passive device.
  • Suboptimal interaction was characterized by earlier peak propulsion timing (≥4%) and a more vertical residual shank posture (>2°).
  • These findings suggest poor coordination between the amputee's limb dynamics and the powered prosthesis during push-off.

Conclusions:

  • This preliminary study underscores the importance of quantifying human-prosthesis coordination.
  • Further research is needed to understand how joint-level coordination impacts overall gait efficiency.
  • Optimizing the interaction between amputees and powered prosthetics is crucial for improving functional outcomes.