The High Flexion Movement Characteristics Research Of Human Tibiofemoral Joint

This research is supported by National Natural Science Foundation of China on research on high-flexion stability michanism of high-flexion artificial knee, studies the high flexion movement characteristics of the tibiafemoral during squat of nature knee and post total knee arthroplasty(TKA).Computer's image processing technology was applied to process the obtained human knee-joint anatomical parameters, and a real structural three-dimensional(3-D) geometric anatomical model of nature knee including the bone tissues and main soft tissues such as ligaments, cartilages, meniscus and patellofemoral ligament were constructed. The simulation resection and prosthesis assembly were carried out on the nature knee model in the CAD environment, there by the 3-D geometric model of knee joint post TKA was established.A dynamic finite element model of natural knee on high flexion was established. In the simulation analysis, two quadriceps loading methods were adopted: three constant force performed simultaneous load; three change force performed simultaneous load. The movement parameters of natural tibiofemoral and patellofemoral were obtained under different loading methods, and more reasonable loading method(three change force preformed simultaneous load) was obtained by compared with previous works. The movement parameters of natural knee joint on high-flexion condition in this method were obtained.Dynamic finite element model after TKA was established. In the simulation model, select the method of three change force performed simultaneous load. The tibiofemoral and patellofemoral movement parameters of knee post TKA were obtained, and then compared them with the nature knee. Also this paper put forward some suggestions on how to improve the PFC prosthesis design and TKA surgery.The 3-D geometric anatomical model of nature knee was built in this research, which can be used to geometry simulation of prosthesis implantation and biomechanics analysis of finite element analysis. In subsequent experiments and simulations, the loading method(three change force performed simultaneous load) was capable of predicting the kinematics accurately during knee flexion, and could be efficient tools for the analysis of TKA and knee prosthesis design. Results of this research could be references for the research of knee pathology, rehabilitation and prosthesis design.