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Related Experiment Videos

Bouncy knee: a stance phase flex-extend knee unit.

L D Fisher, G W Judge

    Prosthetics and Orthotics International
    |December 1, 1985
    PubMed
    Summary

    The Bouncy Knee device enhances above-knee prostheses by providing natural knee movement during walking. Clinical trials showed improved gait symmetry, comfort, and downhill control in amputee patients.

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    Area of Science:

    • Biomedical Engineering
    • Prosthetics and Orthotics

    Background:

    • Above-knee prostheses often lack natural knee flexion during the stance phase.
    • This can lead to gait asymmetry and reduced user comfort.

    Purpose of the Study:

    • To evaluate the efficacy of the Bouncy Knee device in improving gait and comfort for above-knee prosthesis users.
    • To establish a clinical fitting procedure and performance assessment tool for the device.

    Main Methods:

    • An adjustable Bouncy Knee device was fitted to an amputee to determine optimal settings.
    • A clinical trial with six patients assessed gait using instrumented walkways and polarized light goniometry.
    • Cyclic testing was performed on the device post-trial.

    Main Results:

    • Improved gait symmetry was observed in all patients.
    • Patients reported significantly enhanced comfort and better control during downhill walking.
    • The Bouncy Knee unit demonstrated durability under cyclic testing.

    Conclusions:

    • The Bouncy Knee device offers a natural flex-extend action, improving gait mechanics for above-knee prosthesis users.
    • A standardized fitting procedure and assessment goniometer have been developed.
    • The device is suitable for specific prosthetic systems, with a production batch manufactured.

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