基于MRI的全膝有限元模型建立与前交叉韧带重建术模拟方案

目的建立完整的人体膝关节三维有限元模型,并在此基础上建立了用于前交叉韧带重建模拟的胫股骨隧道和人工韧带模型,为进一步分析打下基础。方法以MRI图像作为数据源,运用逆向工程软件Geomagic及有限元分析软件ANSYS9.0,参考大量有关实验测试数据的文献报道,建立所需三维有限元模型。结果建立的膝关节三维有限元模型包括胫腓骨上段、股骨下段、胫股骨软骨层、胫股骨隧道、内外侧半月板、后交叉韧带、内外侧副韧带和髌韧带,几何形状良好。胫腓骨隧道和人工韧带的模拟巧妙简便,基本可以满足有限元分析的需要。结论采用MRI图像建立膝关节三维有限元模型切实可靠,能很好地模拟膝关节内部的真实解剖结构及前交叉韧带重建术中的胫股骨隧道。

Construction of three-dimensional finite element model of knee joint based on MRI images and simulation scheme of anterior cruciate ligament reconstruction

Objective To establish a three-dimensional finite element model of knee joint with tibial and femoral tunnels as a foundation for finite element analysis in anterior cruciate ligament reconstruction .Methods Based on the MRI images,the 3D finite element model of a healthy knee joint was constructed by using the Geomagic and ANSYS 9.0 software.Results The established 3D finite element model consisted of tibia,femur,cartilage of tibia and femur,tibial tunel,femoral tunnel and the ligaments surrounding the knees.The ideal geometry shape met the need of finite element analysis.Conclusion It is a reliable way to construct knee 3D finite element model with MRI images.The finite element model can reflect the geometry structure of knee joint and bone tunnels vividly.