Abstract
A purpose of this study is to examine the effect that quadriceps femoris force gives to joint reaction force and rotation angle of total knee prosthesis during deep knee flexion such as an unique sitting style called "seiza" in Japanese. For the evaluation, we developed the knee motion simulator which could bend to 180 degrees continually simulating the passive flexion motion performed by clinicians. A new type of total knee prosthesis which could bend to 180 degrees is inserted into bone model, and pulled by quadriceps femoris in three kinds of force vector. The results obtained in this study were almost similar to those of the cadaveric experiment. It is suggested that the joint reaction force and rotation angle of total knee prosthesis are affected by shape of prosthesis, a vector of quadriceps femoris force, and bony aliments during deep knee flexion.
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