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Kinetic analysis of the lower limb in visual handicap children

시각장애 아동의 보행 시 하지의 운동역학적 분석

  • Yi, Jae-Hoon (Adapted Physical Activity Laboratory, Korea Nazarene University)
  • 이재훈 (나사렛대학교 재활스포츠연구소)
  • Received : 2011.07.04
  • Accepted : 2011.09.08
  • Published : 2011.09.30

Abstract

This study was to investigate the difference in gait pattern between the visual handicap children and non handicap children in by analyze the biomechanical variation and pattern of lower limb. Therefore, we have made a choice of four visually handicapped children and two subjects, who had no medical disorder for the last six months. In order to collect the gait pattern data of each group, we have used six infrared cameras and one forceplate Also, we have used QTM program to collect the raw data and Visual3D program to calculate kinetic variable. The results were as follows, An/Posterior GRF of breaking phase and propulsion phase in stance phase was lower in visual handicapped children than that of non handicapped children and breaking phase was longer than propulsion phase. extension moment at the ankle was quite lower than general gait pattern and there was little variation at the knee joint which makes the results differ from the general gait pattern. However, hip joint moment was relatively higher than that of other joints. Mechanical variation of lower limb, in case of foot and shank, showed similar results. but generated very low mechanical energy. In thigh, the form of mechanical energy generation was slightly different in each group but generated more mechanical energy than other segments.

이 연구는 시각장애 아동과 비 장애 아동의 보행형태를 비교 분석하여 하지분절의 생체역학적 변화와 패턴 및 이에 대한 시각장애 아동과 비 장애 아동의 차이를 구명하는데 그 목적이 있다. 이를 위해 하지에 최근 6개월간 병적 결함이 없는 시각장애 아동 4명과 비 장애 아동 2명을 선정하였다. 두 그룹의 보행 특성에 관한 자료 수집을 위해 적외선 카메라 6대와 지면반력기 1대를 사용하였다. 또한 기초자료 수집은 QTM프로그램을 이용하였고, Visual3D 프로그램을 이용하여 운동역학적 변인을 계산하였으며 다음과 같은 결론을 얻었다. 지지국면의 전 후 최대 지면반력은 제어기와 추진기 모두 시각장애 아동이 비 장애 아동에 비하여 지면반력이 작게 나타났으며, 제어기의 비율이 추진기에 비하여 긴것으로 나타났다. 하지관절 모멘트의 경우 발목에서는 일반적인 보행에 비하여 신전모멘트가 매우 작게 나타났으며, 무릎관절의 경우 지지국면동안 변화가 거의 없는 것으로 나타나 일반적인 보행 패턴과 상이한 결과로 나타났다. 그러나 엉덩관절 모멘트는 다른 관절에 비하여 상대적으로 크게 나타났다. 하지분절의 에너지 변화는 발과 정강이의 경우 비 장애 아동과 유사한 형태를 보였으나 에너지 발현이 매우 작은 것으로 나타났으며, 대퇴의 발현 형태는 다소 다르지만 다른 분절에 비하여 가장 에너지가 많이 발생하는 것으로 나타났다.

Keywords

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