颈椎有限元模型对几何敏感性的运动分析研究。
PubMed ID  

发表日期  2016年Jul月 


原始出处  机械工程师学会会刊。第H部分，医学工程杂志 
Proceedings of the Institution of Mechanical Engineers. Part H, Journal of engineering in medicine  
作者  Zafarparandeh Iman Erbulut Deniz U Ozer Ali F 


文献标题  颈椎有限元模型对几何敏感性的运动分析研究。 
Motion analysis study on sensitivity of finite element model of the cervical spine to geometry.  
Motion analysis study on sensitivity of finite element model of the cervical spine to geometry.  


文献摘要 
许多颈椎的有限元模型已经被提出，无论是精确的几何学还是几何上的对称近似。然而，很少有研究探讨预测运动反应对颈椎几何结构的敏感性。本研究的目的是评估对称假设对颈椎有限元模型预测运动的影响。我们开发了两个颈椎C2C7的有限元模型。一种模型是基于颈椎的精确几何结构（不对称模型），而另一种模型是关于中矢状面的对称模型（对称模型）。将模型主运动和耦合运动的预测运动范围与所有运动平面在全载荷范围内的实验数据进行了比较。非对称模型和对称模型对主运动预测的最大差异分别为屈曲伸展、左右侧弯和左右轴旋转的最大差异分别为31%、78%和126%。屈伸和侧弯的最小差值为0%，而轴向旋转的最小差值为2%。对称模型预测的最大耦合运动分别为轴向旋转1.5°和侧向弯曲3.6°。在施加侧向弯曲和轴向旋转时，非对称模型预测的耦合运动分别为轴向旋转1.6°和侧向弯曲4°。总体而言，对称模型预测的颈椎运动响应在可接受的范围内，并能正确预测颈椎力矩旋转曲线的非线性。 


Numerous finite element models of the cervical spine have been proposed, with exact geometry or with symmetric approximation in the geometry. However, few researches have investigated the sensitivity of predicted motion responses to the geometry of the cervical spine. The goal of this study was to evaluate the effect of symmetric assumption on the predicted motion by finite element model of the cervical spine. We developed two finite element models of the cervical spine C2C7. One model was based on the exact geometry of the cervical spine (asymmetric model), whereas the other was symmetric (symmetric model) about the midsagittal plane. The predicted range of motion of both modelsmain and coupled motionswas compared with published experimental data for all motion planes under a full range of loads. The maximum differences between the asymmetric model and symmetric model predictions for the principal motion were 31%, 78%, and 126% for flexionextension, rightleft lateral bending, and rightleft axial rotation, respectively. For flexionextension and lateral bending, the minimum difference was 0%, whereas it was 2% for axial rotation. The maximum coupled motions predicted by the symmetric model were 1.5° axial rotation and 3.6° lateral bending, under applied lateral bending and axial rotation, respectively. Those coupled motions predicted by the asymmetric model were 1.6° axial rotation and 4° lateral bending, under applied lateral bending and axial rotation, respectively. In general, the predicted motion response of the cervical spine by the symmetric model was in the acceptable range and nonlinearity of the momentrotation curve for the cervical spine was properly predicted. 

Numerous finite element models of the cervical spine have been proposed, with exact geometry or with symmetric approximation in the geometry. However, few researches have investigated the sensitivity of predicted motion responses to the geometry of the cervical spine. The goal of this study was to evaluate the effect of symmetric assumption on the predicted motion by finite element model of the cervical spine. We developed two finite element models of the cervical spine C2C7. One model was based on the exact geometry of the cervical spine (asymmetric model), whereas the other was symmetric (symmetric model) about the midsagittal plane. The predicted range of motion of both modelsmain and coupled motionswas compared with published experimental data for all motion planes under a full range of loads. The maximum differences between the asymmetric model and symmetric model predictions for the principal motion were 31%, 78%, and 126% for flexionextension, rightleft lateral bending, and rightleft axial rotation, respectively. For flexionextension and lateral bending, the minimum difference was 0%, whereas it was 2% for axial rotation. The maximum coupled motions predicted by the symmetric model were 1.5° axial rotation and 3.6° lateral bending, under applied lateral bending and axial rotation, respectively. Those coupled motions predicted by the asymmetric model were 1.6° axial rotation and 4° lateral bending, under applied lateral bending and axial rotation, respectively. In general, the predicted motion response of the cervical spine by the symmetric model was in the acceptable range and nonlinearity of the momentrotation curve for the cervical spine was properly predicted. 



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