A total hip prosthesis is required to satisfy three prerequisites: 1. Absence of reaction to bone and tissue, 2. Adequate connection with and fixation to the bone, 3. Supportability and durability similar to that of bone.
In order to investigate each of these essential attributes of total hip prosthesis, authors conducted experimental studies.
The latest type of total hip system in our clinic was manufactured after experimental studies which confirmed that the so-called three five-storied pagoda-shaped spikes attached to the artificial acetabulum were more effective than bone cement in achieving fixation between bone and prosthesis. Clinical results at two years after surgery were far more gratifying with this type than with any others.
It has been about twenty years since total knee prostheses were used in our clinic and various types and materials have been used in the course of their development.
Now we use the Jikei total knee prosthesis of so-called universal type with low-friction system as the latest type. In this system a block of HDP may replace the defect after resection of the tumor in the proximal end of tibia or distal end of femur.
Follow-up study after surgery shows good results.
