Abstract
From 1968 to 1985, 375 total hip replacement (THR) and 63 revisional surgeries by total hip prosthesis were performed in our clinic.
The revisional THR surgery was done on patients 49.5 years old on an average and an average of 5.6 years after the first surgery. We evaluated these revisional cases by the J.O.A. score and got follow-up results of 76.8 points, or less than the 85.5 points in first surgery cases of the Charnley type. The most predominate cause for revisional surgery was component loosening (48 joints), and other causes were stem breakage, fracture of femoral shafts and bone perforation.
In the endoprosthesis cases, trouble caused by central migration was seen in 9 joints of 11, and all of the 4 joints with distal migration were accompanied by central migration troubles. So we thought that the main problem with one-piece endoprosthesis might be trouble between the acetableum and the metal head. Therefore, we developed a new ceramic bipolar hip prosthesis in which the outer head was composed of alumina ceramic, which is more bio-inert than a metal head. Our alumina ceramic bipolar hip prosthesis has been clinically applied, and there have been good results with it to date.
