Natali A, Meroi E
Università degli Studi di Padova, Instituto di Scienza e Tecnica delle Construzioni, Italy.
J Biomech Eng. 1990 Aug;112(3):358-63. doi: 10.1115/1.2891196.
This study pertains to the response of intervertebral joint under dynamic axial load. The numerical model represents two vertebral bodies with an interposed disk and uses three-dimensional elements. A transversely isotropic material law is adopted for cortical bone and an isotropic law for cancellous bone. Annulus collagen fibers are modelled using truss elements with no compressive resistance. The disk material is assumed hyperelastic, using a mixed finite element approach, allowing a representation of the disk involving the incompressibility characteristics for the material. The analysis considers finite displacement and strain fields under dynamic load. Intensity, trend and distribution of loads on the vertebral body are deduced from the literature. The problem is investigated with reference to different compressibility levels of disk material related to disk degenerationn phenomena.
本研究涉及动态轴向载荷作用下椎间关节的响应。数值模型表示两个椎体及中间的椎间盘，并使用三维单元。皮质骨采用横观各向同性材料定律，松质骨采用各向同性定律。纤维环胶原纤维采用无抗压阻力的桁架单元进行建模。椎间盘材料假定为超弹性材料，采用混合有限元方法，能够体现该材料的不可压缩特性来描述椎间盘。分析考虑了动态载荷作用下的有限位移和应变场。椎体上载荷的强度、趋势和分布是根据文献推导得出的。针对与椎间盘退变现象相关的不同椎间盘材料压缩性水平对该问题进行了研究。
