[Long-term results with Zweymuller cement-free Alloclassic stem].

AIM OF STUDY

The aim of our study is to show the long-term results using the Zweymüller cementless Alloclassic stem.

METHOD

In our retrospective study 133 from 206 cases (64.4%) were examined after 10.6 years. The examination was done clinically (Scheme after Merie d'Aubigné) and radiologically. The average age was 72 years (48-92 years) at the time of examination.

RESULTS

Intraoperative complications occurred in 3 cases (1.5%), 2 were temporary sciatic-nerve paresis and 1 was a stem fissure. Nine cases had been revised (6.7%). In four of these cases the inlay and the head had to be changed, in two cases mechanical loosening of the cup was found; furthermore, there were one removal of heterotopical ossification and one early infection. Stem problems appeared in only one case with deep infection and had been revised twice. There was neither stem sinking nor mechanical loosening in our series. The average polyethylene wear using a ceramic head with 32 mm diameter was 1 mm after 10.6 years. Clinically excellent results were found in 90% of the cases.

CONCLUSION

The long-term results using the cementless Zweymüller stem with a rectangular transversal section and easy operation technique over 20 years are excellent Because of the cortical anchorage and the biocompatible titanium alloy the Zweymüller stem can be used in all femur forms and in different age groups.