An Implanted Upper-Extremity Neuroprosthesis Using Myoelectric Control

J Hand Surg Am, 2008 · DOI: 10.1016/j.jhsa.2008.01.007 · Published: April 1, 2008

Spinal Cord Injury Neurology Rehabilitation

Simple Explanation

This study evaluates an implantable neuroprosthesis for individuals with cervical level spinal cord injury, aiming to improve hand grasp and elbow extension. The system uses electromyographic (EMG) signals from voluntary muscles to control stimulated function, offering a more natural control method. Three individuals with C5/C6 spinal cord injury received the system, and the results showed increased pinch force and improved daily living activities with the device.

Study Duration

Minimum of 2 years

Participants

Three individuals with C5/C6 spinal cord injury

Evidence Level

Therapeutic IV

Key Findings

1
EMG signals can be recorded from voluntary muscles even during electrical stimulation of nearby muscles.
2
Significant improvements in pinch force and grasp function were observed in all three subjects.
3
Participants demonstrated improvement in at least 5 activities of daily living while using the neuroprosthesis.

Research Summary

This study evaluated a second-generation implanted neuroprosthesis controlled by myoelectric signals to restore hand and arm function in individuals with C5/C6 spinal cord injuries. The results demonstrated that the implanted system significantly increased pinch force, improved grasp function, and enhanced independence in activities of daily living. The findings suggest that myoelectrically controlled neuroprostheses are an effective method for restoring hand function in individuals with midcervical spinal cord injuries.

Practical Implications

Improved Hand Function

The neuroprosthesis can significantly improve hand function, allowing individuals with spinal cord injuries to perform tasks they couldn't before.

Enhanced Independence

Increased independence in activities of daily living can lead to a better quality of life for users of the device.

Customizable Control

Myoelectric control allows for personalized control schemes based on individual capabilities, maximizing functionality.

Study Limitations

1
Surgical revisions were required for some EMG electrodes due to suboptimal placement.
2
Proximal arm strength is a critical factor in subject selection, potentially limiting usage for some individuals.
3
The study involved a small number of participants (3), which may limit the generalizability of the findings.

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