基于MRI图像胫股关节有限元模型的建立

选择1名正常青年男性,排除膝关节疾患,年龄28岁,体质量68 kg,身高175 cm,利用本院1.5TTwinspeed/Excite超导型磁共振扫描仪进行右膝关节连续失状位MRI扫描,扫描方式右膝关节自内向外不间断扫描.所得扫描图像经过Mimics10.0、eomagic Studio 8.0分析软件处理后建立胫骨关节三维模型.并将Geomagic Studio 8.0软件处理生成的STL文件转化为有限元分析软件ANSYS 11.0可接受的IGS文件.以此方法完成了MRI图像下胫股关节高仿真模型的建立.利用MRI图片,经过Mimics10.0、Geomagic Studio 8.0软件处理建立了人体右膝胫股关节的三维计算机模型,为后期取股骨髁表面软骨修复指间关节损伤的有限元仿真分析提供了保证.结果提示,二维MRI图片下所建立三维模型,解决了CT数据对软组织成像较差的不足,能够使模型更接近于真实解剖结构.

Establishing a tibia-femoral joint finite element model according to MRI image

Images corresponded to the right knee of a 27 years old, healthy, male volunteer, weighing 68 Kg, 175 cm height, with no knee joint disease, were selected. The scanning was performed using 1.5T Twinspeed/Excite magnetic resonance tomography. The image was uninterrupted sagittal planes picture, and the scanning way was from the inside to out. The three-dimensional tibia-femoral joint model was established by the MR1 images after they were handled by correlation analysis software (Mimics10.0, Geomagic Studio 8.0). At last, transformed the model format STL file to IGS file, which can be acceptable by analysis software 11.0. On the base of this way, a highly simulation tibia-femoral model was established. It provides a guarantee for the further finite element analysis concerning checking the surface of femoral condyle cartilage to repair interphalangeal joint injuries. The result demonstrated that 3-D computer model established by using 2-D MRI pictures makes up the CT scanning deficiencies on soft tissue, which confirms the model closer to the real anatomical structure.