Maurel N, Lavaste F, Skalli W
Laboratoire de Biomécanique, Ecole Nationale Supérieure d'Arts et Métiers, Paris, France.
J Biomech. 1997 Sep;30(9):921-31. doi: 10.1016/s0021-9290(97)00056-0.
In this study, we present a three-dimensional geometrical and mechanical finite element model of the complete lower cervical spine. The geometry of the vertebrae is parameterized which allows the model to fit different morphologies of vertebrae. The results obtained with a reduced functional unit model (without posterior arch) and with a complete functional unit model were compared with those obtained from experimental studies, when moments of flexion, extension lateral flexion and axial torque were applied. General agreement was observed. Since the model was parameterized, it was possible to study the influence of some geometrical parameters on the mechanical behavior of the cervical spine. Particularly, we focused on the influence of the posterior articular facets as their geometry is very different from those of the other spinal levels and as large inter-individual variability can be observed. The orientation of the facets with regard to the horizontal plane appeared to have a large influence on the 'coupled rotation to principal rotation' ratio, notably in lateral flexion.
在本研究中，我们展示了完整下颈椎的三维几何和力学有限元模型。椎骨的几何形状进行了参数化处理，这使得该模型能够适配不同形态的椎骨。当施加屈伸、侧屈和轴向扭矩时，将简化功能单元模型（无后弓）和完整功能单元模型所获得的结果与实验研究结果进行了比较。观察到总体一致性。由于该模型进行了参数化处理，因此有可能研究一些几何参数对颈椎力学行为的影响。特别是，我们重点关注了后关节面的影响，因为它们的几何形状与其他脊柱节段非常不同，并且可以观察到较大的个体间差异。关节面相对于水平面的方向似乎对“耦合旋转与主旋转”比值有很大影响，尤其是在侧屈时。
