O2632 100% 10-YEAR SURVIVAL OF A HYBRID TOTAL HIP REPLACEMENT (MS-30 CEMENTED STEM AND MORSCHER PRESS-FIT CUP)

Abstract

Aims: We report 10-year results of the THR hybrid system. Femoral Component: Morscher-Spotorno MS-30¨, stainless steel, tapered, with- out collar with matte surface, þxed with Palakos¨+ Gentamycine bone cement. Cup: non-cemented Morscher Press-Fit Cup¨. Material and methods: A consecutive series of 123 THRs in 120 patients (75 female, 45 male) operated on between January 1990 and December 1992 were subjected to follow-up at 10 years. Mean age at surgery was 69 in women, 71 in men. No patients were lost to follow-up. 23 patients (19%) died without needing a revision, and 12 (10%) could only be inter- viewed by phone. Of the remaining 85 patients (71%) with 88 hips (70%) were available for complete evaluation. Mean follow-up was 9.8 (8.0 Ð 12.2 years).Results: Harris Hip scores were excellent and good in 84% (71 pts), moderate in 14% (12 pts) and poor in 2% (2 pts with rheumatoid arthritis). No stems or cups had to be revised. Radiographically 15 hips (13%) had femoral stem-related osteolyses Ð mostly in Gruen zones 2, 6 and 7. 8 stems subsided 2 Ð 5 mm. No infection and no acetabular osteolysis was observed. Conclusion: In 1990, the MS-30 stem was only available with a matte surface, which can impede settling and consequent maintenance of proximal load transfer to bone. Thus, although no revisions were necessary, the 13% osteolyses may relate to the matte surface. From 1994 on, the MS-30 stem has been available with a polished surface. The excellent outcome for the Morscher Press-Fit Cup corresponds to results in other series.