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目的:基于骨质疏松症患者CT图像个体化精准建立单个腰椎(L_2)的有限元模型,并对模型进行骨强度分析。方法:采用交互式医学图像控制系统MIMICS软件对患者的CT图片进行预处理后,导入大型通用有限元软件ANSYS中个体化精准建立L_2有限元模型。通过模拟正常站立、一般活动和突然跌倒时,分别在上终板施加0.3,1.0,4.0MPa轴向载荷,计算最大应变数值以及von Mises应变值高于5 000με骨体积占总体积比率。结果:随着载荷逐步加大,位移、应力和应变也分别变大,具有骨折风险的骨体积也明显增加,分别增加0.08%,38.39%,57.80%.结论:本研究建立的有限元模型符合骨质疏松性单个腰椎的临床特点,模拟了其生物力学特性。
OBJECTIVE: To establish a finite element model of single lumbar vertebrae (L_2) based on individualized CT images of osteoporosis patients and to analyze bone strength. Methods: The CT images of patients were preprocessed by the MIMICS software, and then imported into the large finite element software ANSYS to build the L 2 finite element model precisely. Axial loads of 0.3, 1.0 and 4.0 MPa were applied to the upper end plate to calculate the maximum strain value and the von Mises strain value was higher than the 5 000 με bone volume in the total volume ratio by simulating normal standing, general activities and abrupt fall. Results: With the gradual increase of the load, the displacement, stress and strain also increased respectively, and the bone volume with fracture risk also increased obviously by 0.08%, 38.39% and 57.80% respectively.Conclusion: The finite element model established in this study accords with The clinical features of osteoporotic single lumbar vertebrae model their biomechanical properties.