Price R, Bjornson K F, Lehmann J F, McLaughlin J F, Hays R M
Department of Rehabilitation Medicine, University of Washington School of Medicine, Seattle 98195.
Dev Med Child Neurol. 1991 Jul;33(7):585-95. doi: 10.1111/j.1469-8749.1991.tb14928.x.
Spasticity was quantified in nine children with spastic diplegia, using a sinusoidal displacement of the foot at frequencies from 3 to 12Hz. Ankle-joint stiffness was separated into elastic (energy-storing) and viscous (energy-dissipating) components. 'Path length' was used to represent the variation in stiffness over this frequency range. Compared with 11 unaffected children, a significant difference in path lengths was demonstrated for the children with spasticity. An age-dependent effect was demonstrated when path lengths of unaffected children were compared with those of 10 unaffected adults. A modified path-length measure is proposed which minimizes age dependency, yet enables detection of spasticity. Passive stiffness properties of unaffected adults showed higher elastic stiffness, viscosity and friction than unaffected children. A method was developed to evade the need for temporary nerve blocks to calculate inerital properties of the foot in persons with spasticity.
对9名痉挛型双侧瘫患儿的痉挛程度进行了量化，采用频率为3至12Hz的足部正弦位移。踝关节刚度被分为弹性（储能）和粘性（耗能）成分。“路径长度”用于表示该频率范围内刚度的变化。与11名未受影响的儿童相比，痉挛患儿的路径长度存在显著差异。当将未受影响儿童的路径长度与10名未受影响的成年人的路径长度进行比较时，显示出年龄依赖性效应。提出了一种改进的路径长度测量方法，该方法可将年龄依赖性降至最低，同时能够检测痉挛。未受影响的成年人的被动刚度特性显示出比未受影响的儿童更高的弹性刚度、粘性和摩擦力。开发了一种方法，无需临时神经阻滞即可计算痉挛患者足部的惯性特性。
