Lower-leg inertial properties in transtibial amputees and control subjects and their influence on the swing phase during gait
Lower-leg inertial properties in transtibial amputees and control subjects and their influence on the swing phase during gait
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DOI：
10.1053/apmr.2003.50037
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发表时间：
2003-04-01
影响因子：
4.3
通讯作者：
Stam, HJ
中科院分区：
文献类型：
--
作者：
Selles, RW;Korteland, S;Stam, HJ
目的：确定构成下肢假体最佳惯性特性的因素。设计：实验、对照；基于个体运动学数据和腿部惯性特性的特定对象双摆模型的仿真。将仿真结果与步态分析数据进行比较。环境：步态实验室。参与者：10名胫骨截肢者和10名匹配的健康对照者。干预措施：不适用。主要观察指标：下肢惯性特性；摆动阶段的运动学和动力学；并对双摆模型进行运动学仿真。结果：所有截肢者的惯性特性均有所降低。运动学组间无差异；截肢者的髋关节和膝关节的扭矩和力量都减少了。双摆模型与实验数据的偏差在截肢者中比在对照组中更大。结论：虽然目前的轻量化假体的最佳钟摆性能较差，但它们的轻量化需要较小的关节扭矩来影响钟摆轨迹。因此，在摆动相位运动学和动力学方面，最佳惯性特性将是摆动特性和有效控制之间的折衷。
Objectives: To identify the factors that constitute optimal inertial properties for a lower-limb prosthesis.Design: Experimental, controlled; simulation using a subject-specific double-pendulum model based on individual kinematic data and leg inertial properties. Simulation outcomes were compared with gait analysis data.Setting: A gait laboratory.Participants: Ten transtibial amputees and 10 matched healthy controls.Interventions: Not applicable.Main Outcome Measures: Inertial properties of the lower leg; kinematics and kinetics of the swing phase; and kinematics of double-pendulum model simulations.Results: In all amputees, inertial properties were reduced. No between-group differences existed in kinematics; hip and knee joint torques and powers were reduced in the amputees. Deviations between the double-pendulum model and experimental data were larger in the amputees than in the control subjects.Conclusions: Although current lightweight prostheses have less optimal pendular behavior, their light weight requires smaller joint torques to influence the pendular trajectory. Therefore, optimal inertial properties, in terms of swing phase kinematics and kinetics, will be a compromise between pendular properties and efficient control.