Abstract
We evaluated the clinical and radiographic results of Kyocera Bioceram type THA (total hip arthroplasty) in subjects more than 10 years after surgery in our hospital. Our study focused on 31 joints in 26 patients, the postoperative observation period was an average follow-up of 145 months, the average age at the operation was 56.8 years. The JOA score at the time of the final observation was an average of 70.2 points. We evaluated the clear zone with Nagaya's classification and defined as loosening those X-ray findings in stages 3 and 4. Loosening was seen in 12 joints (38.7%), and at 5 joints (16.1%) we performed revisional THA. The survival rate of Bioceram type THA in which loosening and revisional THA were presumed as the end point were 52.1% and 55.3%, respectively. There was no difference between this study and the survival rate of Charnley Möller (57.3%) type THA in our hospital. The long term results of Bioceram type THA were not as good as was expected. It is concluded that long-term results are influenced by not only the implant design, but also the patient's background, operative techniques, and the preoperative management.
