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The direct fixation system of total hip prosthesis. Research of the possibilities of fixing total hip prosthesis directly to bone.

There are two methods for the fixation of prostheses to bone; one is a method using bone cement and another is the direct fixation of the prostheses to bone. Four types of animal experiments were performed to compare the two methods of fixation. A small pyramid shaped test piece was used to compare the fixation capacity of the socket spike. Also, a special test piece was used to study the time of bone formation, to check the fixation capacity of bone bar formation occurring in the hole in the based part of the prosthetic component. furthermore, models of prosthetic stem and socket were made and attached to the femur and ilium of dog to perform fixation tests and fatigue tests. As a result, any of the tests proved that the direct fixation method without the usage of bone cement was superior to the fixation method using bone cement.

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