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KMID : 0388419990080020025
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Konkuk Journal of Medical Sciences
1999 Volume.8 No. 2 p.25 ~ p.40
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Analysis of the Lower Extremity Joint Angles during Paraplegic Walking Induced by Functional Electrical Stimulation
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Song Tong-Jin
Khang Gon
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Abstract
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This research was designed to measure and investigate the sagittal plane angles of the lower extremity joints during functional electrical stimulation(FES) walking and normal walking. The purpose of this research is to get insights into appropriate stimulation patterns based on the sagittal plane angles.
The subject is a paraplegic male with incomplete lesion at T12. We strengthened his leg muscles via FES excise. And then he started FES standing and walking. The three stimulation combinations we applied to induce FES walking are as following : two knee extensors, two knee extensors and the peroneal nerve(PN), and three knee extensors and PN. We have developed a goniometer system in order to measure sagittal plane angles of the leg joints during walking.
The stance phase of FES walking was significantly longer than that of normal walking. It depended on the stimulation combinations which angle shows the largest amplitude, whereas the amplitude of knee angle was the largest during normal walking. The angle of the hip joint in FES walking decreased initially and then increased
immediately before the swing phase. The knee angle remained 0 during the stance phase of FES walking on the contrary to normal walking. This is because the knee extensors are stimulated throughout the stance phase in order to support the body weight. Although the ankle angle in normal walking increases during the swing phase, the FES walking shows that the ankle angle slightly decreases during the swing phase since he cannot use the ankle flexors. As the knee extensors fatigue, the paraplegic subjects could not maintain the knee angle at 0 during the stance phase and the amplitude of the ankle angle increased.
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KEYWORD
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functional electrical stimulation, paraplegic walking
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