人工腰椎间盘置换的有限元模型研究(英文)

Finite element model of artificial lumbar disc replacement

背景:人工腰椎间盘置换是治疗腰椎间盘突出症的新方法,其理论依据需进一步验证。目的:建立腰椎运动节段人工椎间盘置换的有限元模型,用于进一步的生物力学研究。设计:以脊柱L4～5节段三维模型的相关数据为研究对象的单一样本研究。单位:一所大学医院的骨科。对象:实验于2003-12/2004-08在中南大学湘雅医院骨科研究室完成。选择1名健康男性志愿者作为模拟对象,对其脊柱T12～S1节段进行层厚2mm的连续扫描,共获得CT断层图像264幅,并对CT图像每隔15°进行三维重建,获取用于建立三维模型的相关数据。方法:将CT扫描的腰椎图像结合人体解剖学数据通过3DSMAX软件建模形成正常中国男性L4～5运动节段的三维模型,结合SB-ChaiteⅢ型人工椎间盘的三维模型,用有限元分析软件SAP2000转换成有限元模型。主要结局观察:成功建立了腰椎运动节段的三维模型和有限元模型。结果:建立了腰椎L4～5节段SB-ChaiteⅢ型人工椎间盘置换的有限元模型,模型总节点数为2542个,包括1924个Solid单元,592个Area单元,50个Link单元。结论:通过CT断层扫描、图像数字化处理及计算机辅助设计等方法,可以建立腰椎人工椎间盘置换的有限元模型,用于脊柱生物力学的进一步研究。

BACKGROUND:Artificial lumbar disc replacement is a novel approach to treat lu mbar disc protrusion.But its theoretical basis needs further verification. OBJEC TIVE:To establish finite element model of lumbar disc replacement for biomechan ical studies. DESIGN:A single sample study taking the data of L4 5 three dimensional infin ite element model as object of research. SETTING:Orthopedic Department of Xiangya Hospital of SunYat sen University. PARTICIPANTS:The trial was conducted in the Laboratory of the Orthopedic Depa rtment of Xiangya Hospital from December 2003 through August 2004. A healthy mal e volunteer served as simulation.His T12 S1 underwent continuous CT scanning.Th ere were altogether 264 images with 2 mm in thickness each.Three dimensional im ages were reconstructed every 15°in order to obtain the data for three dimensi onal model. METHODS:The CT images and human anatomical data were processed by 3DSMAX soft ware to establish three dimensional L4-5 model of normal Chinese males.It was then transformed to finite element model after processed by SAP2000 software tog ether with Charite SB Ⅲdisc prosthesis model. MAIN OUTCOME MEASURES:The three dimensional model and finite element model o f lumbar spine were successfully established. RESULTS:The finite element model of Charite SB Ⅲdisc replacement in L4-5 sp ine was established.The total nodes were 2 542 and there were 1 924 Solid units, 592 Area units and 50 link units. CONCLUSION:The finite element model of artificial disc replacement can be est ablished by CT scanning,digital processor and computer aided design,and used for further study on spinal biomechanics.