Goel V K, Kim Y E
Department of Biomedical Engineering, College of Engineering, University of Iowa, Iowa City, USA.
Clin Biomech (Bristol). 1989 Aug;4(3):161-7. doi: 10.1016/0268-0033(89)90020-X.
The changes in the biomechanical characteristics of a ligamentous motion segment as a result of two clinically relevant injuries are investigated using the finite element technique. A three-dimensional, finite element model of a one-half intact motion segment was developed from 1 mm thick transverse CT cross-sections of a lumbar spine specimen. A total denucleation with other structures left intact, and bilateral total discectomy injuries induced in the intact model, led to an approximately two-fold decrease in the disc height and a similar increase in flexion-rotation, in comparison to the intact model. The total removal of the nucleus simulated in both of the injury models increased the force per unit area of contact across the facets. The stresses in the region adjacent to the facets also increased as a consequence of this. Due to the presence of facets and an increase in load transmitted across them, the change in stresses in the vertebral body for the two injury models in comparison to the intact model was not severe. The disc bulge in the posterior region decreased following the two injuries.
采用有限元技术研究了两种临床相关损伤导致的韧带运动节段生物力学特性的变化。从腰椎标本1毫米厚的横向CT横截面建立了一个半完整运动节段的三维有限元模型。在完整模型中进行全髓核摘除而其他结构保持完整，以及双侧全椎间盘切除术损伤，与完整模型相比，导致椎间盘高度降低约两倍，屈伸旋转增加类似程度。在两个损伤模型中模拟的髓核完全摘除增加了小关节面单位接触面积的力。因此，小关节面相邻区域的应力也增加。由于小关节面的存在以及通过它们传递的负荷增加，与完整模型相比，两个损伤模型中椎体应力的变化并不严重。两种损伤后，后部区域的椎间盘膨出减小。
