Simulation Analysis Of Human Kneec Characteristic Of Squant Movement And The Effect Releasing Patellar Tendon After TKA

This research was supported by National Natural Science Foundation of China on research on high-flexion stability mechanism of high-flexion artificial knee,studies the human kneec characteristics of squant movement and the affection of thirty percent of the upper end,thirty percent of the lower end and thirty percent of ends of patellar tendon was released after TKA(total knee arthroplasty)surgery on the squat motion characteristics of human knee joint.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,which include the bone tissues and main soft tissues such as ligaments,cartilages,meniscus,circulate ligaments,collateral ligaments,patellar tendon and patellofemoral ligament was constructed.The simulation resection and prosthesis assembly were carried out on the basis of the nature knee model,there by the 3-D geometric model of knee joint post TKA was established.A dynamic finite element model of natural knee on squat exercise was established.In the simulation analysis,the movement parameters of natural patellofemoral and tibiofemoral were obtained.Then,studies the relevant literature,a comprehensive comparative analysis of the squat motion characteristics of patellofemoral and tibiofemoral was conducted.The validity of the natural knee analyzes results in this paper was verified and a summary about the squat motion characteristics of patellofemoral and tibiofemoral was made.At the same time relevant conclusions and some suggestions about the uniform of knee movement standard were made.Dynamic finite element model after TKA was established.And then dynamic finite element models were established,which thirty percent of the upper end,thirty percent of the lower end and thirty percent of ends of patellar tendon was released.The squat movement parameters of above four knee models were obtained.And then the result of the knee after TKA and before patellar tendon released with the nature knee was compared.Data difference obtained before and after TKA.Also some suggestions on how to improve the PFC prosthesis design and TKA surgery were given.The results of the knee before and after patellar tendon released were compared.The determined value affection of different parts of patellar tendon was released after TKA(total knee replacement)surgery on the squat motion characteristics of human knee joint were obtained.The results of the simulation analysis of knee squat movement before and after the releasing of patellar tendon after TKA show that,compared with the situation of patellar tendon was not released,the datas of patella flexion rotation tital and proximal-distal translation with respect to femur were bigger,the datas of patella medial-lateral anterior-postior translation with respect to femur and the datas of femur adduction-abduction medial-lateral anterior-postior proximal-distal translation with respect to tibia were smaller in the situation of patellar tendon was released.At the same time,the degree of change in squat of the knee was vary in different parts of the patellar tendon was released.Results of this research could be references for the research of knee pathology,rehabilitation and prosthesis design.