Based On Mimics The Human Body Finite Element Model Of Knee Joint

The anatomical structures and biomechanics characteristics of human knee joint have much important on studying the bone fracture mechanism, such as making surgical planning, postoperative rehabilitation, as well as designing prosthesis. In this paper, the finite element method will be used to study the biomechanical properties of the human knee.The main work of this paper was to establish the3D finite element model of human knee by Mimics, simulate and analyze the stress-strain of the various parts of the knee joint under different loads. Further details include the following aspects:(1) The CT data got from the No.301Hospital were pretreated by smoothing filter, image segmentation, registration and fusion, the MC algorithm was used for extracting the isosurface tissue of the knee joint in order to rebuild the triangular surface mesh model of the knee;(2) Having established the three-dimensional finite element model of the patients knee from301Hospital, the geometric model of knee joint which contained the tibia, femur and patella would be rebuild in Mimics by the methods of editing the masks, Thresholding and region growing and so on. The following was to assign the model of compact bone, cancellous bone, marrow bone in different material properties.(3) By calculation and analysis the3D model objected to a single gait cycle of dynamics and modal, the affection of loads stress distribution on the femur could be obtained. The results showed that close to the femoral head in one-third and the lower one, that came out stress concentration, and maximum displacement occurred close to the femoral head in one-third, the results of stimulation calculation were proved by the patient’s CT data from the No.301Hospital.(4) This paper simulated the70kg adult tibia and knee joint force under the condition of daily life as well as the patella force conditions bent60°to90°.The results show in2/3of the lower end of the tibia,it turned up stress concentration, both inside and outside collapsed downward, and the outside one even worse. When the external load was greater3times than the weight of the adult, the tibia fractures were much more apt to occur at the lower end of the patella, given the displacement and loads constraint, the stress concentration occurred which gave the suggestion where fracture happened. These conditions were well with the actual clinical situations.In summary, this paper established a model of total knee and made an finite element analysis of the bony part. By contrasting the data of other scholars and clinical trial, the3D model proved to be accurate and efficient. And at the same time, the research provides a reliable reference for prosthesis, the works of this paper provide the method and basis for further biomechanical research as well. It has important significance to know the daily activities impact on the knee, what’s more, the academic significance and market value may be even important for knee replacement and clinical applications.