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Intramuscular EMG-Driven Musculoskeletal Modelling: Towards Implanted Muscle Interfacing in Spinal Cord Injury

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    Summary
    This summary is machine-generated.

    Surface and implanted EMG sensors provide similar joint torque estimates for controlling assistive devices in both healthy individuals and spinal cord injury patients. This suggests implanted sensors are reliable for exoskeleton actuation.

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    Area of Science:

    • Biomechanics
    • Neuroprosthetics
    • Rehabilitation Engineering

    Background:

    • Electromyography (EMG)-driven modeling estimates joint torques to control assistive devices.
    • Surface EMG sensors are common, but implanted EMG sensors offer advantages despite localized data.
    • The impact of sensor type on torque estimation accuracy is not fully understood.

    Purpose of the Study:

    • To compare surface and intramuscular EMG measurements for estimating joint torques using EMG-driven modeling.
    • To evaluate the efficacy of different EMG sensor types in healthy individuals and spinal cord injury (SCI) patients.

    Main Methods:

    • Developed subject-specific musculoskeletal models for four healthy subjects and three SCI patients.
    • Collected motion capture, surface EMG, intramuscular EMG, and ground reaction force data during walking trials.
    • Calculated joint torque estimates using EMG-driven modeling with both surface and intramuscular EMG inputs.

    Main Results:

    • Intramuscular and surface EMG-driven models showed similar correlations between experimental and predicted joint torques.
    • This finding was consistent across both healthy participants and SCI patients.
    • No significant difference in torque estimation accuracy was observed based on EMG sensor type.

    Conclusions:

    • This study provides the first direct comparison of non-invasive (surface) and implanted (intramuscular) EMG sensors for torque estimation in assistive device control.
    • Implanted EMG sensors demonstrate comparable performance to surface EMG for torque estimation.
    • Implanted EMG sensors show significant potential as a reliable input for controlling assistive exoskeleton joint torques.