10 YEARS OF CEMENTLESS IMPLANTATION OF TO TAL HIPS USING THE ZWEYMULLER STEM

A retrospective study of the first consecutive 111 cementless Zweymull er Stems has been performed. 56 cases have been followed clinically an d radiologically with an interval of 10-11 years. The average harris h ip score was 90,7 pts, the cumulative success rate of the stem was 97, 96% after 10-11 years. The frequency of bony reactions around the stem and their changes during the course of time could be followed in 40 i mplants with a complete radiologic documentation at 5 and 10 years pos toperative. Hypertrophic changes of the bone around the tip of the ste m remained unchanged from the fifth to the tenth year but there was an increase of proximal lucencies (27% at 5 yrs, 35 at 10 yrs), widening of the calcar (20% at 5 yrs, 25% at 10 yrs) and stress shielding (30% at 5 yrs, 47% at 10 yrs).