Improving Walking with an Implanted Neuroprosthesis for Hip, Knee, and Ankle Control After Stroke

Area of Science:

• Neuroscience
• Rehabilitation Medicine
• Biomedical Engineering

Background:

• Stroke often results in hemiparesis, affecting gait and mobility.
• Restoring functional ambulation is a key goal in post-stroke rehabilitation.
• Current interventions may not fully address complex gait impairments.

Observation:

• A 64-year-old male with chronic left hemiparesis post-stroke participated in the study.
• An 8-channel implanted pulse generator with intramuscular electrodes was used to stimulate hip, knee, and ankle muscles.
• Gait was assessed under volitional walking (baseline and post-training) and stimulation-assisted conditions.

Findings:

• Gait speed increased from 0.29 m/s at baseline to 0.35 m/s with volitional training, and dramatically to 0.72 m/s with stimulation.
• Quantitative motion analysis revealed improvements in spatial-temporal gait characteristics, indicating more symmetrical and dynamic walking.
• The multijoint neuroprosthesis approach showed significant functional gains.

Implications:

• Implanted neuroprostheses offer a promising avenue for enhancing gait function in individuals with post-stroke hemiparesis.
• This technology can lead to clinically relevant improvements, potentially improving quality of life and independence.
• Further research into multijoint neuroprosthetic strategies is warranted for stroke recovery.