Using induced accelerations to understand knee stability during gait of individuals with muscle weakness.
Using induced accelerations to understand knee stability during gait of individuals with muscle weakness.
复制标题
使用诱导加速度来了解肌无力患者步态期间膝盖的稳定性。
DOI：
10.1016/j.gaitpost.2005.05.007
复制
发表时间：
2006
期刊：
影响因子：
2.4
通讯作者：
Stanhope,StevenJ
中科院分区：
文献类型：
--
作者：
Siegel,KarenLohmann;Kepple,ThomasM;Stanhope,StevenJ
本病例系列的目的是量化在站立阶段步态中肌肉无力个体使用的不同代偿策略产生膝关节伸展的有效性。研究对象为三名男性，他们股四头肌的抗重力力量不足，下肢其他部位有不同形式的无力。他们在没有辅助设备的情况下以自己选择的速度独立行走。采用六摄像头双力平台运动捕捉系统对骨盆和双侧下肢进行步态分析。根据运动数据计算关节角和净内矩。进行诱导加速度分析，量化各下肢关节力矩和重力产生膝关节角加速度的相对能力。结果表明，在步态过程中，多种四肢内和跨肢的适应策略可以控制膝关节的位置。一名受试者几乎完全通过髋伸力矩产生膝关节伸展。另一种方法较少依赖髋关节伸肌力矩（39%），更多依赖踝关节足底屈肌力矩（61%）来实现膝关节伸展。第三名受试者使用同侧髋关节伸肌力矩（24%）和对侧踝关节足底屈肌力矩（67%）来辅助膝关节伸展。每个受试者所选择的策略可能受到他们的总体受损模式和可用补偿的有效性的影响。本案例系列演示了诱导加速度分析如何增强传统的步态分析，以扩展和增强我们对代偿运动控制策略的理解。
The purpose of this case series was to quantify the effectiveness of different compensatory strategies used by individuals with muscle weakness to produce knee extension during the stance phase gait. Subjects were three males with less than anti-gravity strength in the quadriceps femoris and a variable pattern of weakness elsewhere in the lower extremity. They walked independently at a self-selected speed without assistive devices. Gait analysis of the pelvis and bilateral lower extremity segments was performed with a six-camera, two force platform motion capture system. Joint angles and net internal moments were computed from the motion data. Induced acceleration analysis was performed to quantify the relative ability of each lower extremity joint moment and gravity to produce knee angular acceleration. Results showed that a variety of adaptive strategies both within and across limbs can control knee position during gait. One subject generated knee extension almost exclusively via the hip extensor moment. Another relied less on the hip extensor moment (39%) and more on the ankle plantar flexor moment (61%) to create knee extension. The third subject used the ipsilateral hip extensor moment (24%) and the contralateral ankle plantar flexor moment (67%) to assist knee extension. The strategy selected by each subject likely was influenced by both their total pattern of impairments and the effectiveness of the available compensations. This case series demonstrates how an induced acceleration analysis can augment a traditional gait analysis to expand and enhance our understanding of compensatory movement control strategies.