腰椎间盘退变后应力变化的有限元分析  

Finite Element Analysis on Stress Change of the Lumbar Disc Degeneration

作　　者：闫家智[1,2] 吴志宏[1] 汪学松[1] 邢泽军[1] 赵宇[1] 仉建国[1] 王以朋[1] 邱贵兴[1] 

机构地区：[1]中国医学科学院北京协和医学院北京协和医院骨科,北京100730 [2]首都医科大学附属北京天坛医院骨科

出　　处：《中国医学科学院学报》2009年第4期464-467,共4页Acta Academiae Medicinae Sinicae

基　　金：国家自然科学基金(30772191);中国博士后科学基金(20060400567)~~

摘　　要：目的利用有限元分析方法,评估腰椎间盘退变后的生物力学变化。方法利用MIMICS软件对正常腰椎的CT图像进行预处理后,导入ABAQUS软件建立正常椎间盘L3～L4节段的三维有限元模型。通过改变椎间盘退变后对应的材料属性,建立退变椎间盘L3～L4节段的有限元模型。对模型施加0.3MPa均布轴向压缩载荷,比较正常和退变椎间盘的纤维环、髓核、软骨终板、关节突关节的应力。结果与正常椎间盘比较,退变椎间盘的应力分布发生改变,纤维环周边承受较大应力,髓核的压应力明显降低,软骨终板的应力集中在外周偏后;关节突关节面的应力明显增大。结论有限元方法可以直观地观察椎间盘退变对腰椎的影响,是对临床研究的必要补充。Objective To investigate the mechanical changes of the degenerated lumbar disc with finite element analysis. Methods A three dimensional finite element model of a human lumbar spine at the L3-L4 disc was established by the software MIMICS and ABAQUS based on computer tomography images. Degeneration was modeled by changes in geometry and material properties. The model was loaded with 0.3 MPa in axial plane. The von Mises stress on the annulus fiber,nucleus pulposus,endplate and facet joints in healthy and degenerated discs was compared. Result Compared with healthy discs, the yon Mises stress of disc dis- tributed in the side of annulus fiber, the stress of nucleus pulposus decreased remarkably, the stress of endplate distributed in the posterior part, and the stress of facet joints increased for the degenerated disc. Conclusion The finite element models can provide a method of understanding the relationship between biomechanical performance of the disc due to disc degeneration.

关 键 词：腰椎间盘退变 有限元分析 

分 类 号：R681.53[医药卫生—骨科学]