Simulation Analysis Of The Effects Of The Medial Collateral Ligament Rupture On The Human Natural And After TKA Knee Flexion

This research was supported by the National Natural Science Foundation of China“the research on high-flexion stability mechanism of high-flexion artificial knee(project number: 31370999)”,and the effects of medial collateral ligament rupture on the flexion movement characteristics of human nature knee joint and artificial knee joint were studied.The main research was as follows:(1)First of all,the material properties of the main ligament of human knee joint(medial collateral ligament,lateral collateral ligament,anterior cruciate ligament,posterior cruciate ligament and patella tendon)were tested by uniaxial tensile test.Then,the physical properties of ligament of knee ligament were studied by using the strain energy density function constitutive model(Neo-Hookean model).The Neo-Hookean model was obtained according to the results of the measured ligament test.Besides,the material properties of the ligaments were applied to the simulation of the flexion movement of the rupture of medial collateral ligament.In addition,a special fixture for soft tissue physical performance test was designed in the experiment,and the problem of ligament clamping was solved in the test of human knee ligament properties.The fixture can be used for the test of ligament properties more accurately.(2)The rupture of medial collateral ligament of human knee joint was emulated by using finite element software,the three-dimensional finite element model of the human nature of knee joint of the rupture of superficial medial collateral ligament tissue fracture,the rupture of deep medial collateral ligament tissue fracture and complete rupture of the medial collateral ligament were established.The material properties of the experimental test of the ligament was applied,and the tibio-femoral and patello-femoral joint flexion movement characteristics of before and after the medial collateral ligament injury was obtained by the simulation analysis.Through comparison and analysis can be known: The rupture injury of medial collateral ligament reduces the degree of internal rotation of the femur;In high flexion stage,the rupture of medial collateral ligament of lower femur moves,increased the degree of adduction of the femur,and adduction to achieve maximum knee flexion degree decreased.At the same time,the rupture of the medial collateral ligament also reduced the lateral movement and internal tilt of patella relative to the femur.In addition,the medial collateral ligament rupture damage the greatest impact on the knee flexion characteristics,followed by rupture of the deep medial collateral ligament rupture,and the superficial medial collateral ligament tissue rupture has little effect on knee joint motion characteristics.(3)The three-dimensional finite element model of artificial knee joint after total knee arthroplasty(TKA)of the rupture of superficial medial collateral ligament tissue fracture,the rupture of deep medial collateral ligament tissue fracture and complete rupture of the medial collateral ligament were established by simulating the rupture of medial collateral ligament of artificial knee joint.The material properties of the experimental test of the ligament was applied,and the tibio-femoral and patello-femoral joint flexion movement characteristics of before and after the medial collateral ligament injury was obtained by the simulation analysis.Through comparison and analysis can be known:The rupture of medial collateral ligament reduces the degree of internal rotation of the knee joint,and increases the degree of internal displacement of the femur;At the same time,the medial collateral ligament rupture also greatly reduced the internal rotation of the patella.In addition,the different degree of rupture of the medial collateral ligament to the knee joint was also different.The results of this study can be provide a reference for the study of physiological function and prevention of sports injuries of medial collateral ligament?guide the patient's rehabilitation training?as well as the design and optimization of artificial knee prosthesis.