articles
赵英红
2016, 40(12): 0-0.
【摘要】目的：建立基于CT图像的正常人和胫骨平台骨折患者的胫骨三维有限元模型, 计算出骨骼模型的位移和应力分布。方法：通过对 1名健康成年人和1名胫骨骨折患者的膝关节的多排螺旋 CT 扫描，获得连续断层图片，将CT断层图像导入Mimics软件中建立人体胫骨的三维面网格模型后，应用ANSYS软件对模型进行体网格划分，材料赋值，生成健康成人和胫骨骨折患者的胫骨有限元模型，并对模型进行了分析计算。结果：从实验结果可以看出，正常人和患者的等效应力均沿胫骨向下逐渐减小，且均在胫骨的上中1/3处出现了应力集中现象，而患者还在骨折处出现应力集中；正常人的形变位移梯度比骨折患者明显；正常人与患者在整体应力分布变化上差异明显。结论：本研究成功建立了胫骨三维有限元模型，得出了正常人与骨折患者之间胫骨的生物力学特性差异，为骨科医生手术治疗方案的制定提供了重要参考依据。
【Abstract】 Objective To establish CT image-based, three-dimensional finite element models of healthy tibiae and tibiae with tibial plateau fractures, with the displacement and stress distribution of the tibial models calculated. Methods Continuous-time tomographic images of knee joints of a healthy adult and a patient with tibial plateau fractures were obtained using multi-slice spiral CT scan, and input to the Mimics software to establish three-dimensional surface mesh models of tibiae. The models underwent global meshing procedures and material properties assignment to construct finite element models of normal and plateau-fracture tibiae in the ANSYS software, with the established models analyzed and calculated. Results The experiment showed that equivalent stress decreased gradually down the tibiae and concentrated in the one-third of the upper and middle regions in both types of tibiae. Moreover, concentration of stress was also present in the locus of fractured tibia. The deformation displacement gradients were more evident in healthy tibia than the fractured tibiae. There were significant differences in overall stress distribution in two types of tibiae. Conclusion This study is effective in constructing three-dimensional finite element models of tibiae, and demonstrating the differences in biomechanical properties of healthy and plateau-fracture tibiae, which might provide reference and guidance for orthopedic regimens.
