| Objective The three-dimensional model of normal human femoral condyle and surface cartilage was established by the magnetic resonance imaging (MRI). The different mechanics reference was given to analysis the stress distribution cloud of the femoral condyle, and through measured stress value of the specified node to verify the validity of the model. Then use this model to simulate different size, different regions of the surface cartilage of the femoral condyle removing, after that a preliminary study of mechanics changes of the femoral condyle was performed.Methods Select a normal young men, and rule out the right knee joint disease. 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 femoral condyle and surface cartilage model was established by the MRI 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. The established three-dimensional model was meshed and simulated different size, different regions removing aftert it was imported to ANSYS 11.0. At last the comparison of stress distribution was performing.Results Using MRI images, a 3-D finite element model of the right knee femoral condyle was established after it was dealt with Mimics10.0,Geomagic Studio 8.0. It provides a guarantee for the further finite element analysis study of the surface cartilage. Success to simulate different size,different regions of the surface cartilage of the femoral condyle removing, and draw under various simulated load condylar's stress-strain graph.Conclusions 1,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.2,The three-dimensional finite element model set up in this project belong to static model, it's very close to the actual anatomical structure of the femur condylar,so it can be a very good analysis to the situation of the stress condyle.3,All the related mechanical analysis are static simulation,and the outcome for predicting the role of surface cartilage and the mechanical distribution of femuromal candyle provide a reference. |
