青少年特发性脊柱侧凸有限元模型的建立及其意义

Development of the Personalized Finite Element Model of the Adolescent Idiopathic Scoliosis and Its Significance

本研究的目的是建立青少年特发性脊柱侧凸(AIS)患者脊柱的三维有限元模型,用于进一步研究AIS的支具治疗、手术治疗、病因和病理等领域的生物力学。为此,我们采用螺旋CT扫描AIS患者的T1上缘至骶尾骨末端,获得图像的DICOM格式文件,用Dicomworks软件将其转化为BMP格式的图像,经GETCT软件处理,获得点云的TXT格式文件后,转入IMAGEWARE软件,将各层的点云连线后,输出保存为IGS文件格式,再转入通用有限元分析ANSYS8.0软件,利用软件的前处理工具进行蒙面,建立三维立体几何模型,继而赋予材料物理属性,进行网格划分,建成了三维有限元分析模型。结果显示所建模型外观逼真,与该AIS患者的脊柱几何形态相似性好。我们认为通过CT扫描获得准确的AIS患者脊柱的几何构型数据,并在此基础上可以建立高仿真个体化侧凸脊柱的有限元模型。

This study was aimed to develop the personalized finite element model （FEM） of spine of a scoliotic adolescent. We derived the data of spine of a scoliotie adolescent using spiral computed tomography. Then by using a series of computer aided design {CAD）software, the patient-specific 3D finite dement modal of spine of a scoliotic adolescent was developed. Results show the 3-D FEM of spine of AIS adolescent was established according to patient-specific geometric parameters. The model had an appearance similar an reality. We concluded that the way in this study is an exact and effective one to develop the FEM of spine of scoliotic adolescent. It is possible to analyze and research the biomechanical behavior of the scoliotic spine using the personalized FEM.