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Related Experiment Video

Updated: Aug 27, 2025

Engineering Platform and Experimental Protocol for Design and Evaluation of a Neurally-controlled Powered Transfemoral Prosthesis
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Ambulation Control System Design for a Hybrid Knee Prosthesis.

Ann M Simon, Frank Ursetta, Kunal Shah

    IEEE ... International Conference on Rehabilitation Robotics : [Proceedings]
    |September 29, 2022
    PubMed
    Summary

    This study presents a hybrid prosthetic knee control system that powers stair climbing and remains passive for other activities. Early results show accurate prediction of user intent for active or passive modes in transfemoral amputees.

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    A Structured Rehabilitation Protocol for Improved Multifunctional Prosthetic Control: A Case Study

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    Area of Science:

    • Biomedical Engineering
    • Rehabilitation Engineering
    • Prosthetics and Orthotics

    Background:

    • Transfemoral amputees require prosthetic knees to restore ambulation.
    • Passive knees offer limited functionality, while active knees provide more powered assistance.
    • Semi-active prosthetic devices aim to balance power usage and functionality.

    Purpose of the Study:

    • To develop and evaluate an ambulation control system for a lightweight Hybrid Knee prosthesis.
    • To enable powered assistance for stair climbing while utilizing passive modes for other activities.
    • To assess the accuracy of an intent recognition system for predicting active vs. passive control.

    Main Methods:

    • Development of a hybrid knee prosthesis control system.
    • Implementation of an ambulation control strategy switching between powered and passive modes.
    • Design and testing of an offline and online intent recognition system.
    • Evaluation with one able-bodied user and one individual with transfemoral amputation.

    Main Results:

    • The hybrid knee system is designed for powered stair climbing and passive operation during level walking, inclines, and stair descent.
    • Preliminary results demonstrate low error rates in predicting user intent for active or passive control.
    • Successful intent recognition was shown in both able-bodied and transfemoral amputee participants.

    Conclusions:

    • The developed ambulation control system shows promise for enhancing prosthetic knee functionality.
    • The hybrid approach offers a potential solution for energy-efficient prosthetic ambulation.
    • Accurate intent recognition is crucial for seamless transitions between powered and passive prosthetic knee modes.