노인 보행 시 발과 경골 Coupling 패턴과 Variability

Abstract

The purpose of this study was to compare the coupling angle between the foot movement in the frontal plane and the tibia movement in the horizontal plane during walking, as well as its variability between old men aged 70 to 80 and young men aged twenties. Twenty-four men, 12 young subjects and 12 old subjects, walked on a walk way at their normal speed. The motion of the lower extremity during walking was recorded using a six-camera Qualisys ProReflex system at operating 200Hz to collect the 3-D coordinates. To determine the variability, first of all, angular displacement of the foot and the tibia segment in the 3-D was calculated using with Cardan technique and then coupling angle between two segments was determined in a modified vector coding technique. The statistical analyses were repeated for the averages of each of 5 stride phase, mid-stance, toe-off, swing acceleration, swing deceleration, and heel-strike.The conclusion indicated that the elderly depended on the foot eversion and internal rotation of the tibia during walking and inversion/eversion action of the foot in older group was less than the internal/external rotation of the tibia, but reverse in younger group. In addition, significant difference in coupling angle and its variability from the toe-off to the swing acceleration were observed between two groups(p<.05).

Keywords