抄録
In a series of this research, there have been already introduced the simulated analytical results on the femoropatellar joint desease and operation, using the three-dimensional kinematic model.
However, the above model is inapplicable owing to muscular geometric nonlinearities in such a condition at large angles of the knee flexion that the rectus femoris tendon wrapps around the femoral groove.
So, in this paper, the model of tendofemoral contacting and ligamentoustibial contacting was presented, using the theory of geodestic line in the differential geometry. Then, the simulated computer analysis was performed.
Typical results through the simulation are as follows:
Rotating angles of the patella on the three dimensional axes are relatively small, because the patella is engaged in the femoral intercondylar fossa.
The magnitude of femoropatellar joint reaction forces on medial and lateral sides indicate nearly equal, and diminish gradually as the knee flexion proceed.
Patella ligament tensile force is reduced to about 85% of rectus femoris contracting force.
