• 대한의용생체공학회:의공학회지
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• 제32권2호
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• pp.165-176
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• 2011

The femoral nerve innervates the quadriceps muscles and its dermatome supplies anteromedial thigh and medial foot. Paralysis of the quadriceps muscles due to the injury of the femoral nerve results in disability of the knee joint extension and loss of sensory of the thigh. A child could walk independently even though he had injured his femoral nerve severely due to the penetrating wound in the medial thigh. We measured and analyzed his gait performance in order to find the mechanisms that enabled him to walk independently. The child was eleven-year-old boy and he could not extend his knee voluntarily at all during a month after the injury. His gait analysis was performed five times (GA1~GA5) for sixteen months. His temporal-spatial parameters were not significantly different after the GA2 or GA3 test, and significant asymmetry was not observed except the single support time in GA1 results. The Lower limb joint angles in affected side had large differences in GA1 compared with the normal normative patterns. There were little knee joint flexion and extension motion during the stance phase in GA1 The maximum ankle plantar/dorsi flexion angles and the maximum knee extension angles were different from the normal values in the sound side. Asymmetries of the joint angles were analyzed by using the peak values. Significant asymmetries were found in GA1with seven parameters (ankle: peak planter flexion angle in stance phase, range of motion; ROM, knee: peak flexion angles during both stance and swing phase, ROM, hip: peak extension angle, ROM) while only two parameters (maximum hip extension angle and ROM of hip joint) had significant differences in GA5. The mid-stance valleys were not observed in both right and left sides of vertical ground reaction force (GRF) in the GA1, GA2. The loading response peak was far larger than the terminal stance peak of vertical ground reaction curve in the affected side of the GA3, GA4, GA5. The measured joint moment curves of the GA1, GA2, GA3 had large deviations and all of kinetic results had differences with the normal patterns. EMG signals described an absence of the rectus femoris muscle activity in the GA1 and GA2 (affected side). The EMG signals were detected in the GA3 and GA4 but their patterns were not normal yet, then their normal patterns were detected in the GA5. Through these following gait analysis of a child who had selective injuries on the knee extensor muscles, we could verify the actual functions of the knee extensor muscles during gait, and we also could observe his recovery and asymmetry with quantitative data during his rehabilitation.

• Journal of Oral Medicine and Pain
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• 제30권1호
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• pp.45-55
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• 2005

오른손잡이와 왼손잡이가 있듯이 저작도 주로 사용하는 쪽이 있는 편측저작습관자와 양쪽을 다 사용하는 비편측저작자가 있다. 본 연구는 1년 이상 지속된 편측저작습관이 저작근과 턱관절에 미치는 영향을 알아보고자, 연세대학교 치과대학 재학생 및 치과병원 교직원 중 참여하기를 희망하는 편측저작습관자 46명, 비편측저작습관자 36명, 총 82명의 지원자를 대상으로 저작근의 근활성도와 교합력을 검사하여 다음과 같은 결과를 얻었다. 연구에 앞서 설문 및 임상검사를 통하여 연구에 영향을 끼칠 수 있는 특기할 전신병력이나 불규칙한 치열 및 비정상적인 교합을 가진 자는 배제하였다. 1. 편측저작습관자군에서 안정위와 최대 이악물기(maximal voluntry contraction; MVC)상태에서의 저작측과 비저작측간 근활성도는 차이를 나타내지 않았다 (p>0.05). 2. 안정위 시 전측두근과 교근에서의 근활성도 비대칭 지수는 편측저작습관자군과 비편측저작습관자군 사이에 차이를 나타내지 않았다(p>0.05). 3. 최대 이악물기 시 교근의 근활성도 비대칭 지수는 편측저작습관자군에서 비편측저작습관자군 보다 높게 나타났으며 (p<0.05), 전측두근의 근활성도 비대칭 지수는 편측저작습관자군과 비편측저작습관자군간에 차이를 나타내지 않았다(p>0.05). 4. 편측저작습관자군에서 저작측과 비저작측간의 평균교합력과 교합접촉면적은 차이를 나타내지 않았다(p>0.05). 5. 편측저작습관자군과 비편측저작습관자군간의 평균교합력의 비대칭 지수와 교합접촉면적의 비대칭 지수는 차이를 나타내지 않았다(p>0.05). 이상의 연구결과 편측저작습관은 저작근의 근활성도와 평균교합력 및 교합접촉면적에 영향을 미쳐 변화를 일으키기 보다는, 정상적인 기능을 하는 생리적 비대칭이라고 보는 것이 타당하다고 생각한다. 향후 연구 시 편측저작자와 비편측저작자를 구분하기위한 객관적인 기준의 제시가 필요하다고 생각한다.