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The effects of dual-channel functional electrical stimulation on stance phase sagittal kinematics in patients with hemiparesis.

J Electromyogr Kinesiol. 2012 Dec 8. pii: S1050-6411(12)00200-3. doi: 10.1016/j.jelekin.2012.10.017. [Epub ahead of print]

The effects of dual-channel functional electrical stimulation on stance phase sagittal kinematics in patients with hemiparesis.

Source

Department of Physical Therapy, The Faculty of Social Welfare and Health Sciences, The University of Haifa, Haifa, Israel; Clinical Department, Bioness Neuromodulation, Ra'anana, Israel.

Abstract

Sixteen subjects (aged 54.2±14.1years) with hemiparesis (7.9±7.1years since diagnosis) demonstrating a foot-drop and hamstrings muscle weakness were fitted with a dual-channel functional electrical stimulation (FES) system activating the dorsiflexors and hamstrings muscles. Measurements of gait performance were collected after a conditioning period of 6weeks, during which the subjects used the system throughout the day. Gait was assessed with and without the dual-channel FES system, as well as with peroneal stimulation alone. Outcomes included lower limb kinematics and the step length taken with the non-paretic leg. Results with the dual-channel FES indicate that in the subgroup of subjects who demonstrated reduced hip extension but no knee hyperextension (n=9), hamstrings FES increased hip extension during terminal stance without affecting the knee. Similarly, in the subgroup of subjects who demonstrated knee hyperextension but no limitation in hip extension (n=7), FES restrained knee hyperextension without having an impact on hip movement. Additionally, step length was increased in all subjects. The peroneal FES had a positive effect only on the ankle. The results suggest that dual-channel FES for the dorsiflexors and hamstrings muscles may affect lower limb control beyond that which can be attributed to peroneal stimulation alone.

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