O2634 PRIMARY HYBRID TOTAL HIP ARTHROPLASTY. A 5 TO 10 YEAR FOLLOW-UP STUDY

Abstract

The use of hybrid þxation (cementless acetabular component and cemented femoral component) in primary total hip arthroplasty has been based on several observations: 1. The long-term problems associated with cemented acetabular þxation 2. The durable long-term results reported with cemented femoral þxation and 3. The encouraging reports of different centers on using the above technique. Methods: Between 1992 and 1997, 194 primary hybrid total hip arthroplasties were performed in our department in 171 patients. Follow up was performed at 5 to 10 years after the procedure. The average age at the time of the procedure was 69 years (range, 44 Ð 82 years). There were 102 women (123 hips) and 69 men (71 hips). 2 different groups of arthroplasties were used; one consisting of a microporous coated cup and one consisting of a hydroxyapatite-layered cup. The patients were prospectively observed clinically using the Harris Hip Score and radiographically. Results: The Harris Hip Score was preoperatively 43 in average (range, 15–55) and postoperatively increased to 88 points (range, 61–100). Five arthroplasties were revised; 1 due to acetabular loosening, 3 due to femoral loosening and 1 due to aseptic loosening. No cup migration of more than 1 mm could be observed. There were no radiolucencies around any of the screws used for the þxation of the cup. Conclusions: The clinical results of the hybrid total hip arthroplasties show excellent intermediate period results in respect of clinical performance and þxation durability.