Abstract
Cementless type of total hip prosthesis has especially been used in the cases of revision of severe osteoarthritis and rheumatoid arthritis and also as a primary procedure instead of cement type recently. However, problems regarding loosening of the type remain on controversy. The present study was performed to solve the problems such as inserting angle of the socket, resection angle of femoral neck, type of the stem of femoral component and materials having good biocompatibility. Method: Biomechanical calculating system (Rigid Body Spring Model by Kawai), mechanical forces using Instron type testing machine, and histopathological and contact microradiographic studies were used on the experimental animals. Results: Ideal inserting angle of the socket into the acetabulum was thirty five degrees, resection at the base of the femoral neck with eight millimeters' height of calcar from the intertrochanteric line. Press fitting type of the femoral component into the intramedullary canal was favorable. Al2O3 or hydroxyapatite ceramics showed good biocompatibility to bone. Based on these experimental achievement, clinical application using total hip system has been successful.
