椎间盘与韧带对腰椎变形影响的生物力学研究

Intervertebral disc and ligament on deformation effect of the lumbar spine bio-mechanics research

利用CT扫描图像和三维重建软件,重建羊腰椎L1-L4的三维实体模型,建立包括椎体、椎间盘和韧带的有限元模型,数值计算得到椎体,椎间盘和韧带的应力分布规律.数值计算结果表明:施加单一牵引载荷和侧向弯曲载荷时,考虑间盘与韧带时腰椎的位移场与未考虑间盘与韧带时腰椎的位移场有明显的区别,对椎体的等效应力影响较小.文中结果表明,椎间盘与韧带明显影响腰椎变形的,研究腰椎变形需要考虑椎间盘与韧带.

Using CT scan images and 3D reconstruction software, the sheep lumbar BMD at L1-L4 was rebuilded. The threedimensional entity model including vertebral body, intervertebral disc and ligament was constructed into a finite element model. The vertebral body, intervertebral disc and the rule of the stress distribution of the ligament were analysed. The numerical calculation results showed that under the single traction load and/or lateral bending load, there was a significant difference of the displacement field when the plate and ligament between spinal disc are considered or not, but there was smaller influence on the equivalent stress of vertebral body. The results showed that the intervertebral disc and ligament significantly affect the deformation of the spine, and the deformation simulation need to consider the existence of intervertebral disc and spinal ligaments.