Abstract
Aim: To assess the clinical results, radiographic fixation and polyehtylene wear of a second generation cementless porous coated acetabular cup for a follow-up of 9.6 years
Material and Methods: 81 Duraloc 500 (De Puy) cups with polyethylene (PE) Enduron implanted between 1992–1995 are analysed. The mean follow-up was 9.6 years. Clinical results and radiographic fixation according to Jonhston et al. and according to Engh et al. were evaluated. PE mean wear and so-called “bedding in” process was estimated with anteroposterior pelvic radiographs which were digitized and analysed using a software package with Sychterz method. X-rays were measured at 6 weeks (zero position), 6 months, 12 months and annually thereafter. In all cases a Profile (De Puy) femoral stem was used
Results: There was 1 PE exchange because of a later dislocation (Kaplan-Meier survivorship 98.67 % at 10 years). All cups were osseointegrated. There was no osteolysis (Kaplan-Meier 100% at 10 years). There were no PE liner ruptures. Zero position (PE wear at 6 weeks) for PE was 0.1651 + 1339 mm and mean wear was 0.1108 + 0.793 mm.
Conclusions: All cups, except one, improved clinical results and showed stable fixation. There was no acetab-ular osteolysis in this series. In spite of a low zero position, mean PE wear was similar to other cups.
Theses abstracts were prepared by Professor Roger Lemaire. Correspondence should be addressed to EFORT Central Office, Freihofstrasse 22, CH-8700 Küsnacht, Switzerland.
