[10 years of cementless implantation of total hip endoprosthesis using Zweymüller's stem]

A retrospective study of the first consecutive 111 cementless Zweymüller Stems has been performed. 56 cases have been followed clinically and radiologically with an interval of 10-11 years. The average harris hip 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 implants with a complete radiologic documentation at 5 and 10 years postoperative. Hypertrophic changes of the bone around the tip of the stem 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).