Effects of spinal cord injury on lower-limb passive joint moments revealed through a nonlinear viscoelastic model
Effects of spinal cord injury on lower-limb passive joint moments revealed through a nonlinear viscoelastic model
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DOI：
10.1682/jrrd.2004.01.0015
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发表时间：
2004-01-01
影响因子：
--
通讯作者：
Kirsch, R
中科院分区：
文献类型：
--
作者：
Amankwah, K;Triolo, RJ;Kirsch, R
我们开发了一个数学模型来描述下肢被动关节力矩，以在身体健全的志愿者和长期运动完全性截瘫患者的小样本中研究和比较这些力矩。对四名脊髓损伤 (SCI) 受试者和五名未受伤受试者进行等动力测试，测量踝关节、膝关节和髋关节在矢状面和冠状面运动范围内的被动力矩。我们将 11 参数非线性粘弹性模型拟合到获取的被动力矩数据（均方误差范围为 0.020 至 5.1 Nm(2)），以比较受试者群体并确定关节速度和相邻关节之间被动耦合的影响。尽管 SCI 组和健全组的被动力矩曲线在形状上表现出许多相似之处，但比较两组被动力矩曲线的重复测量方差分析 (ANOVA) 表明，除膝关节外，每个关节都存在统计学显着性差异 (p < 0.01)。这种新的被动关节力矩模型应该有助于检查被动属性的变化如何影响双足功能和运动。
We developed a mathematical model to describe the lower-limb passive joint moments to investigate and compare these moments in a small sample of able-bodied volunteers and individuals with long-standing motor complete paraplegia. Iso-kinetic tests, which were performed on a sample of four subjects with spinal cord injuries (SCIs) and five uninjured individuals, measured the passive moments at the ankle, knee, and hip joints throughout their ranges of motion in the sagittal and coronal planes. We fitted an 11-parameter nonlinear viscoelastic model to the acquired passive moment data (mean square error ranging from 0.020 to 5.1 Nm(2)) to compare subject populations and to determine the influences of joint velocity and passive coupling between adjacent joints. Although the passive moment curves of the SCI and able-bodied groups exhibited many similarities in shape, a repeated measures analysis of variance (ANOVA) that compared the passive moment curves of the two groups indicated a statistically significant (p < 0.01) difference for every joint except the knee. This new model for passive joint moments should prove to be useful in examining how changes in passive proper-ties affect bipedal function and movement.