Kinematics Of Knee Prostheses Research Articles

0941 屈伸運動を対象とした人工膝関節の術後動態評価(OS20-3:人工関節とバイオエンジニアリング3)

0941 屈伸運動を対象とした人工膝関節の術後動態評価(OS20-3:人工関節とバイオエンジニアリング3)

OS2-2-5 Measurement and analysis for deep squatting using a complete flexion knee prosthesis

The object of this study is to analyze kinetics and kinematics of knee prosthesis. We have developed a new type of prosthesis which is capable of deep knee flexion. We created a 3D mathematical model incorporating the above prosthesis. Using this model simulation was performed under the simple knee flexion. As for simple knee flexion motion, a cadaver experiment was also performed.We performed the simulation for simple knee flexion to verify the validity of the model by comparing the results with those of the experiment. Our model can calculate the knee motion precisely because in our model not only a femorotibial component but also a patellofemoral component are included, and major muscles, ligaments and tendons are taken into account. From our model, we could calculate contact trajectories and contact forces on the articulating surfaces, ligaments' strains as well as valus-valgus and rotation angles of the knee. When we compared the resultant forces during simple knee flexion, the variation pattern from simulation was in good agreement with that of experiment. And we confirmed the feasibility and usefulness of our model.

A 3D Model Analysis of Knee Prosthetic Motion (1st Report, A 3D Mathematical Model of Knee Joint after Total Knee Arthroplasty)

The object of this study is to introduce contact points' trajectories on the articulating surfaces and kinematics of knee prosthesis under various walking conditions for various types of prosthesis to help to design new prosthesis. Since in vivo measurement of knee prosthetic articulation is almost impossible, we created a 3D mathematical model consisted of the tibio-femoral and patello-femoral compartments of artificial knee joint. As the model could reproduce the comprehensive and sophisticated motion of a knee prosthesis, it is possible to generate and analyze various walking conditions with various types of knee prostheses and hence reproduce joint rotation mismatch, excessive deviation of contact points and a loft-off between the media and lateral sides of the joint.