盆骨及腰椎模型构建
胸腰椎骨盆段的有限元建模和静态/动态验证。
Finite element modeling and static/dynamic validation of thoracolumbar-pelvic segment
Guo, L. X., & Li, W. J. (2020). Finite element modeling and static/dynamic validation of thoracolumbar-pelvic segment. Computer methods in biomechanics and biomedical engineering, 23(2), 69–80.
Abstract
Finite element method is an efficient tool to investigate the biomechanics of human spine. The key to finite element method is to reconstruct a complete and accurate finite element model. In this study, a three-dimensional finite element model of thoracolumbar structure including complete pelvis (T12-pelvis) was built using computed tomography technology. The modeling process has been explained in detailed. During the process of validation, the model was assigned with non-linear material property for static or dynamic analyses. In static analysis, the vertebral geometry parameters of T12-L5, the axial displacement, the posterior disc bulge and the intradiscal pressure of intervertebral disc, range of motion under six loading cases and facet joint forces were obtained and compared with the experimental data. In dynamic analysis, motion segments were loaded with sinusoidal displacement at 1 Hz in the anterior-posterior and axial directions to verify the reaction force. The first-order resonant frequencies in the vertical direction from one motion segment and two motion segments to the entire model were obtained. The study provides a detailed and accurate method of validation to verify the finite element model of thoracolumbar spine.
Keywords: T12-pelvis; Thoracolumbar spine; dynamic analysis; finite element method; static analysis; thoracolumbar-pelvic; validation.
摘要 有限元法是研究人体脊柱生物力学的有效工具。这个有限元方法的关键是重构一个完整而精确的有限元模型。在本研究采用计算机断层扫描技术建立了包括完整骨盆（t12-骨盆）在内的胸腰椎结构的三维有限元模型。建模过程已被详细说明。在验证过程中，将该模型具有非线性材料特性，用于静态或动态分析。在静态分析中，获得T12-L5的椎体几何参数、轴向位移、椎间盘后突出和椎间盘内压力、6例负荷情况下的运动范围和关节突关节力，并与实验数据进行比较。在动态分析中，运动节段在前后和轴向上加载1 Hz的正弦位移，以验证反作用力。得到了从一个运动段和两个运动段到整个模型在垂直方向上的一阶谐振频率。本研究为胸腰椎有限元模型的验证提供了一种详细而准确的验证方法。
图1：建模与分析的流程图
图2：t12-骨盆的有限元模型
图3：静态和动态分析下的加载和边界条件
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