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Journal of the Korean Academy of Rehabilitation Medicine 1997;21(1):160-172.
Dynamic Electromyography of Quadriceps Muscle and Kinematic Analysis in Stiff-Legged Gait.
Sung, Duk Hyun
Depatjment of Physical Medicine and Rehabilitation, Samsung Medical Center, Korea.
경직하지 보행에서의 사두고근의 동적근전도 검사 및 운동형상학적 분석
성덕현
서울성심 재활의학과교실
Abstract

Patients who have had strokes or other central nervous system disorders, often walk with stiff legged gait on the affected site. We analyzed the gait of adult hemiparetic and paraparetic patients who were community ambulators with stiff legged gait using a three dimensional motion analyzer and the dynamic electromyography. The purpose of this study is ⸁ to classify the dynamic EMG pattern of quadriceps muscle during preswing and swing-phase ⸂ to evaluate the characteristics of the kinematic motion curve of the knee in stiff legged gait.

Dynamic EMG patterns of quadriceps muscle during preswing and midswing phase could be classified into four classes(Class I: rectus femoris and vastus medialis and vastus lateralis fire simultaneously, class II: rectus femoris and one of vasti fire simultaneously, class III: only rectus femoris fires, class IV: no abnormal firing of rectus femoris and vasti).

All of paraparetic patients had sufficient hip flexor strength and the class III EMG pattern was the most frequently observed pattern in these patients. Hemiparetic patients showed diverse dynamic EMG patterns with a similar frequency(4 cases of class I, 6 cases of class III, 5 cases of class IV).

In the kinematic analysis, a dimpling on the motion curve of the knee during preswing and initial swing-phase was the most characteristic finding which reflected the blocking or delay of the knee flexion(smooth convexity which reflected the progressive increase of flexion disappeared.). It was noted most frequently in paraparesis patients who had the class III EMG pattern. In hemiparesis patients who had poor hip flexor strength, there was no dimpling on the motion curve of the knee even though they showed the class III EMG pattern. Only half numbers of hemiparesis patients who had sufficient hip flexor strength with the class III EMG pattern showed a dimpling on the motion curve.

Key Words: Stiff legged gait, Dynamic electromyography, Quadriceps spasticity
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