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首页> 外文期刊>Journal of Biomechanics >Biomechanical characterization and clinical implications of artificially induced crouch walking: Differences between pure iliopsoas, pure hamstrings and combination of iliopsoas and hamstrings contractures.
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Biomechanical characterization and clinical implications of artificially induced crouch walking: Differences between pure iliopsoas, pure hamstrings and combination of iliopsoas and hamstrings contractures.

机译：人工诱发的蹲伏行走的生物力学特征和临床意义：纯肌，纯肌以及and肌和肌挛缩的结合之间的差异。

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The purpose of this study was to characterize biomechanically three different crouch walking patterns, artificially induced in eight neurologically intact subjects and to compare them to selected cases of pathological crouch walking. The subjects were equipped with a lightweight mechanical exoskeleton with artificial muscles that acted in parallel with hamstrings and iliopsoas muscles. They walked at a speed of approximately 1m/s along the walkway under four experimental conditions: normal walking (NW), hamstrings contracture emulation (HAM), iliopsoas contracture emulation (IPS) and emulation of both hamstrings and iliopsoas contractures (IPSHAM). Reflective markers and force platform data were collected and ankle, knee and hip-joint angles, moments and powers were calculated. HAM and IPSHAM shifted ankle-angle rotation profiles into dorsiflexion during midstance compared to IPS and NW where ankle-angle trajectories were similar. HAM, IPS and IPSHAM shifted the knee angle of rotation profiles into flexion during stance, compared to NW. IPS and IPSHAM shifted hip angle of rotation profiles toward pronounced flexion while HAM shifted hip angle of rotation profile toward extension, compared to NW. HAM and IPSHAM significantly increased ankle moment during midstance, compared to IPS and NW where ankle moment profiles were similar. All experimental conditions exhibited similar behavior in the knee-moment profiles during midstance while IPS and IPSHAM knee-moment profiles exhibited significantly higher knee-extension moment during terminal stance and pre-swing. In the hip joint all experimental conditions exhibited similar shape of hip moment profiles throughout the gait cycle. HAM and IPS kinematic and kinetic patterns were qualitatively compared to two selected clinical cases, showing considerable similarity. This implies that distinct differences in kinematics and kinetics between HAM, IPS and IPSHAM may be clinically relevant in helping determine the relative contribution of hamstrings and iliopsoas muscles contractures to particular crouch walking.
机译：这项研究的目的是在八个力学上完整的受试者中人工诱导的三种不同的蹲伏行走方式的生物力学特征，并将它们与病理性蹲伏行走的选定病例进行比较。受试者配备了轻巧的机械外骨骼，其中的人造肌肉与绳肌和op腰肌平行。他们在四个实验条件下以大约1m / s的速度沿着人行道行走：正常行走（NW），绳肌挛缩仿真（HAM），肌挛缩仿真（IPS）以及绳肌和ili肌挛缩仿真（IPSHAM）。收集反射标记和测力平台数据，并计算踝，膝和髋关节的角度，力矩和力量。与踝角轨迹相似的IPS和NW相比，HAM和IPSHAM在中位期间将踝角旋转曲线转变为背屈。与NW相比，HAM，IPS和IPSHAM在站立期间将膝盖的旋转角度改变为屈曲状态。与NW相比，IPS和IPSHAM将髋关节旋转角度剖面朝着明显的屈曲方向移动，而HAM将髋关节旋转角度剖面朝着伸展方向移动。与脚踝力矩曲线相似的IPS和NW相比，HAM和IPSHAM在中途明显增加了脚踝力矩。在中途，所有实验条件下的膝矩曲线均表现出相似的行为，而在末期站姿和预挥杆过程中，IPS和IPSHAM的膝矩曲线表现出明显更高的膝盖伸展力矩。在髋关节中，所有实验条件在整个步态周期中均表现出相似的髋力矩轮廓形状。定性地将HAM和IPS的运动学和动力学模式与选定的两个临床病例进行比较，显示出相当的相似性。这意味着HAM，IPS和IPSHAM之间的运动学和动力学差异明显，可能在临床上有助于确定relevant绳肌和腰肌挛缩对特定蹲伏行走的相对影响。

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