下腰椎的三维有限元分析

Finite element analysis of inferior lumbar spine

目的为研究下腰椎活动提供三维有限元力学模型。方法选取成年男性的下腰椎典型CT影像,建立几何模型后利用有限元划分和分析软件建立有限元模型,设定边界条件并加载负荷,记录下腰椎在前屈、后伸、侧屈和轴向旋转等不同工况下的运动范围和应力分布。结果建立的下腰椎三维有限元模型中4面体单元总数为114953。模型在各工况下的运动范围与体外生物力学试验所测定的结果比较,差异无统计学意义(P>0.05)。结论建立的下腰椎三维有限元模型能够模拟下腰椎的生理活动,可用于进一步的研究。

Objective To establish a normal lumbar spine 3-dimensional（3D） finite element model（FEM） and discuss the biomechanics of the lumbar motions. Methods A geometrical model was constructed on the basis of a healthy adult male＇s lumbar CT image.The lumbar spine FEM was established by finite element analysis software.After setting the boundary and loading the burden,the lumbar spine＇s range of motion and stress distribution in different institutions such as anterior flexion,posterior extension,left or right bending and axial rotating were recorded. Results The lumbar spine FEM included 114 953 tetrahedron units.The results of the FEM matched the results of the in vitro experiment of biomechanics. Conclusion The lumbar spine FEM can imitate the motions of the lumbar spine.