目的 探讨髋离断截肢者穿戴假肢的步态特征，并分析其与正常步态产生差异的原因，辅助临床的诊断评估。方法 通过便携式人体运动捕捉设备和足底压力分析系统，采集5名髋离断截肢者运动学和足底压力信息，并与对照组15例健康志愿者比较，对比截肢者与正常人以及截肢者患侧与健侧之间的步态差异。结果 截肢者双支撑期占比高于正常步态，截肢者患侧和健侧步长、步长时间、加载响应期、支撑中期、预摆期、摆动期占比与对照组相比有显著性差异。截肢者步态时相对称性指数为0.60±0.05，与患侧相比，健侧支撑期延长，步长缩短，地面反作用力大于患侧，压力中心轨迹向患侧偏移。结论 髋离断截肢者与正常人的步态具有明显差异，其步行能力弱，步态对称性差，身体重心缺乏连贯性。研究结果为新型髋假肢的机械结构和控制系统设计提供实验依据与理论分析。
Objective To analyze the gait characteristics of hip disarticulation amputees, and analyze the reasons for their differences from normal gait, so as to assist clinical diagnosis and evaluation. Methods Through the portable human motion capture device and plantar pressure analysis system, the kinematics and plantar pressure information of 5 hip amputees were collected and compared with 15 healthy volunteers in control group. Gait differences between the amputees and normal subjects and between the affected leg side and the healthy leg side of the amputees were compared. Results The proportion of double-support period for hip amuptees was higher than that of normal gait. Step length, step time, loading response period, mid support period, pre-swing period, proportion of the swing period for the affected leg side and healthy leg side of hip amputees showed significant differences with those of control group. The relative symmetry index of the gait for hip amputees was 0.60±0.05. Compared with the affected leg side, the support period of the healthy leg side was extended, the step length was shortened, the ground reaction force was greater than that of the affected leg side, and the center of pressure trajectory shifted to the affected leg side. Conclusions The gait of hip amputees is significantly different from that of normal people. Hip amputees have weak walking ability, poor gait symmetry, and they lack of continuity in the body’s center of gravity. The results provide experimental basis and theoretical analysis for the design of mechanical structure and control system of novel hip prosthesis.