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Improvement in step clearance via calf muscle stimulation
T Bajd1, M Stefancic, Z Matjacić
1Faculty of Electrical Engineering, University of Ljubljana, Slovenia.
Medical & Biological Engineering & Computing
|March 1, 1997
Summary
Functional electrical stimulation (FES) of calf muscles improves leg swing in spinal cord injury patients. This technique enhances ground clearance and reduces swing time, aiding mobility during walking.
Area of Science:
- Biomechanics
- Neurorehabilitation
- Human movement science
Background:
- Incomplete spinal cord injuries impair lower extremity function and gait.
- Restoring effective leg swing is crucial for mobility and reducing fall risk.
- Existing assistive technologies have limitations in gait restoration.
Purpose of the Study:
- To investigate the biomechanical effects of electrically stimulated calf muscles on swinging leg movement.
- To assess the efficacy of functional electrical stimulation (FES) in patients with incomplete spinal cord injuries.
- To evaluate FES during both stationary and crutch-assisted walking conditions.
Main Methods:
- Patients with incomplete spinal cord injuries underwent functional electrical stimulation (FES).
- Ankle plantar flexors were stimulated, followed by peroneal stimulation to trigger a flexion reflex.
- Knee extensors were inactivated prior to stimulation.
- Biomechanical analysis was performed during stationary and crutch-assisted walking.
Main Results:
- FES of ankle plantar flexors significantly increased lower extremity ground clearance.
- FES-assisted heel lifting led to the elimination of extensor tone.
- Stimulation effectively shortened the swing time during gait cycles.
Conclusions:
- Functional electrical stimulation of calf muscles is a viable method to improve the effectiveness of the swinging leg movement.
- FES enhances gait biomechanics by increasing ground clearance and reducing swing time in individuals with incomplete spinal cord injuries.
- This approach shows promise for improving mobility and functional ambulation in this patient population.