With the increased use of (THA) in younger patients with more activity and more wear and stress, the ceramic on ceramic bearing surfaces decrease the rates of wear and increase the prosthesis longevity.
Patients and Methods: 58 patients (66 hips) evaluated after THA operation using ceramic bearing surfaces. There were 40 males and 18 females with mean age of 34 years (range: 26-48). The etiology was avascular necrosis of femoral head in 42 hips, and posttraumatic hip arthrosis in 24 hips. Clinically, the indications of operation were disabling pain, marked restriction in hip motions, and flexion adduction deformity. Harris hip score was used in clinical evaluation preoperatively, postoperatively and at last follow up for all patients. For radiological evaluation we used the criteria of Lins et al for acetabular evaluation and Engh et al. for femoral evaluation.
Results: The mean follow-up period was 82 (range, 66–102) months. Clinically, the mean Harris Hip Score improved from 50.5 (range, 24–66) to 89 (range, 45–98) [p < 0.001]. At the last follow ¬up, excellent results were in 24 hips (36.5%), and good results in 30 (45.5%), fair in 8 hips (12%), and 4 hips (6%) had poor results. No hip had evidence of subsidence, loosening, or osteolysis. A radiolucency of 1 mm of was seen in 2 zones in 8 hips (14%), (in 5 hips it was in zones 1 & 2, and in zones 2 & 3 in 3 hips). There were no progression of these lucencies up to last follow up. In the femoral stem, there were four stems with radiolucent line of 3mm in 2 zones but clinically the patients had no pain and stems were stable until last visit.
Conclusion: Total hip replacement with ceramic on ceramic bearing surfaces are functioning well with minimal complications and low rate of loosening in a 5-8 years follow up according to this study.