大腿義足膝継手の機械特性と義足歩行との関連性 : 流体制御方式と定摩擦方式膝継手を用いて

抄録

The purpose of this study is to analyze the effect of mechanical properties of above-knee protheses on amputee gait. In this paper, the mechanical properties of knee joints of above-knee prostheses and the gait data for above-knee amputees with different prosthetic knee joints are reported. The angle and the moment of seven knee joints of above-knee protheses in different angular velocities were measured by a muscular training system (Kawasaki Jyuko Ltd.). The angular velocities were changed from 20 deg/sec to 220 deg/sec. Gaits of four normal subjects and three above-knee amputees at different walking speeds were measured by three-dimensional motion measuring system (Hamamatsu Hotonikus Ltd.) and force plates (Kyowa Dengyo Ltd.). The angular displacement, joint moment, and power of the hip and knee joints were calculated by a link segment model. The walking speeds were in cadence 80, 100, and 120 step/min. Prosthetic knees used in this study were Mauch S-N-S Low Resistance (hydraulic), HOSMER Dupaco (hydraulic), and OTTO BOCK 3R-15 (constant friction). As a result, the mechanical properties of knee joints differed. For the gait data, the angular displacement and the moment of the hip joint of the above-knee amputees showed jerky movements when the constant friction prosthetic knee was used. The constant friction prosthetic knee could not achieve smooth hip movement in the swing phase because of insufficient knee function. On the other hand, the hydraulic prosthetic knee could achive smooth hip movement in the swing phase. It was almost the same movement as in normal subjects.