利用MIMICS和ABAQUS建立正常人颈椎的三维有限元模型

Finite element modeling and validation of the normal cervical spine using MIMICS and Abaqus

[目的]建立符合人体解剖结构的颈椎三维有限元模型,并验证其有效性,以用于后续的颈椎生物力学分析。[方法]选择1名健康男性志愿者,采集其颈椎数据,利用MIMICS软件进行数据处理,建立实体模型,然后导入有限元分析软件Abaqus进行网格划分,并添加椎间盘及主要韧带肌肉等结构,建立人体颈椎有限元模型。在此模型上施加2.0N.M的作用力,模拟颈椎在前屈、侧屈和旋转工况下的反应,与其他颈椎有限元模型和体外生物力学实验数据进行对比验证。[结果]整个模型包括C2～76个椎体、C2、3～C6、75个椎间盘及后部结构与主要韧带,共有472 065个单元和98 708个节点。在模拟外力作用下,在前屈、侧屈和旋转工况条件下的活动度与之前的实验结果高度吻合。[结论]建立的颈椎三维有限元模型具有良好的生物逼真度,可以用于颈椎临床生物力学分析。

[ Objective] This study was conducted to develop a detail, three dimensional and anatomically accurate finite element model （FEM） of human cervical spine structure and validate it against other FEM and in vitro experimental data, for the use of subsequent biomechanical analyses of human cervical. [ Methods ] The computed tomography data of a disease - free male volunteer were used in the study. The pictures were input to MIMICS software to process and output a three - dimension en- tity model, then the model was inputted into the FE software Abaqus to divide into mesh, added discs and main ligaments and muscles, and then a cervical FEM was obtained. The model accuracy was validated by comparing it with previously published FE model and in vitro experimental results for different movements of anteflexion, lateral bending and axial rotation. [ Results ] The complete FEA model comprised six vertebras of C2-7 , five discs of C2,3 - C6,7, posterior structure and the main ligaments of the cervical spine, which consisted of 472065 elements and 98708 node points. The results show that force - displacement response under anteflexion, lateral bending and axial rotation was correlated well with previous literature and experimental results. [ Con- clusion ] The established FEM is accurate with the human cervical spine and is competent in the use of the biomechanieal analy- sis in clinical study of cervical spine.