摘要
目的为研究下腰椎活动提供三维有限元力学模型。方法选取典型成年男性的下腰椎椎CT影像,建立几何模型後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114,953。模型在各工况下的运动范围与体外生物力学试验所测定结果在统计学上无显着差异。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.可用于追一步研究.
Objective: To establish a normal lumbar spine 3-dimensional (3D) nonlinear finite element model (FEM) and discuss the biomechanics of the lumbar motions. Methods: Select a healthy adult male's lumbar CT image and process it by materialize mimics software to achieve the superficial 3D image, and then process by CAD software to a 3D entity. Mesh these 3D entities by finite element analysis (FEA) software. Assign different materials in different mechanical parameters and get an online 3D inferior lumbar spine FEM. After setting the boundary, under the 500 N preload the model is loaded the 15 Nm to simulate the flexion/extension, left/right bending and rotating. The range of motions will compare the results of experiment in vitro. In the same time, observe the stress distribution of the FEM and the stress on the disc. Results: The FEM includes 114,953 tetrahedron units; the results of the FEM match the results of the in vitro experiments of biomechanics. Conclusion: The FEM can imitate the motions of a lumbar spine.
关键词
下腰椎
生物力学模型
三维有限元
lumbar spine
biomechanics
finite element analysis