Influence of passive elements on prediction of intradiscal pressure and muscle activation in lumbar musculoskeletal models
Influence of passive elements on prediction of intradiscal pressure and muscle activation in lumbar musculoskeletal models
复制标题
被动元件对腰椎肌肉骨骼模型椎间盘内压力和肌肉激活预测的影响
DOI：
10.1016/j.cmpb.2019.05.018
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发表时间：
2019
影响因子：
6.1
通讯作者：
Ming Zhang
中科院分区：
文献类型：
--
作者：
Kuan Wang;Lejun Wang;Zhen Deng;Chenghua Jiang;Wenxin Niu;Ming Zhang
背景和目的本研究的目的是探讨结合各种被动元件（可以代表椎间盘、小关节和韧带的组合或单独效应）对腰椎肌肉激活和L4-L5椎间盘内压力的预测的效果。方法将代表椎间盘、小关节和韧带的被动元件添加到现有的具有非线性旋转刚度或力应变关系的腰椎肌肉骨骼模型中。该模型被输入躯干屈曲、伸展、轴向旋转和侧向弯曲的运动学，以计算肌肉激活和L4-L5椎间盘内压力。结果在躯干轴向旋转中，具有代表小关节关节的元素的模型预测的椎间盘内压力值远高于去除这些元素的模型预测的椎间盘内压力值。在躯干弯曲时，具有被动元件的模型表现出比不具有被动元件的模型更低的伸肌激活。在躯干屈曲、伸展、轴向旋转和侧弯结束时，带有完整被动元件的模型预测的椎间盘内压力值分别是没有被动元件的模型预测值的120.6%、92.5%、334.8%和74.9%。结论在将小面关节建模为具有旋转刚度的元件时必须小心，因为它们可能会导致躯干轴向旋转时椎间盘内压力的高估。将韧带作为弹簧状元素包含在内可以改善对躯干屈曲时屈曲松弛现象的模拟。未来的模型需要考虑被动元件的详细特性，以便更多地了解腰椎的力学。
Background and objectiveThe objective of this study was to investigate the effect of incorporating various passive elements, which could represent combined or individual effects of intervertebral disc, facet articulation and ligaments, on the prediction of lumbar muscle activation and L4-L5 intradiscal pressure.MethodsThe passive elements representing the intervertebral disc, facet articulations, and ligaments were added to the existed lumbar musculoskeletal model with nonlinear rotational stiffness or force-strain relationships. The model was fed with kinematics of trunk flexion, extension, axial rotation and lateral bending to calculate muscle activation and L4-L5 intradiscal pressure.ResultsIn the trunk axial rotation, the intradiscal pressure values predicted by the models with elements representing facet articulation were much higher than that predicated by models removing these elements. In the trunk flexion, the models with passive elements showed lower muscle activation of extensors than model with no passive elements. At the end of trunk flexion, extension, axial rotation and lateral bending, the intradiscal pressure values predicted by model with intact passive elements were 120.6%, 92.5%, 334.8% and 74.9% of the values predicted by model with no passive elements, respectively.ConclusionsCaution must be taken while modeling facet articulation as elements with rotational stiffness, as they may lead to overestimation of intradiscal pressure in trunk axial rotation. The inclusion of ligaments as spring-like elements may improve the simulation of flexion-relaxation phenomenon in trunk flexion. Future models considering detailed properties of passive elements are needed to allow more access to understanding the mechanics of the lumbar spine.