Abstract
Introduction: Malpositioning of cups and stems in total hip replacement lead to a higher wear and dislocation and revison rate. Navigation of implant components should lead to a more accurate postion of THR.
Method: in 2001–2004 we did 728 THR. 557 cups and 67 stems were navigated wirht a kinematic, radiation-free system (OrthoPilot). The data were evaluated for cup anteversion and inclination, for leg lengthening and antetorsion of the stem, for technical exclusions, complications , as dislocation, thrombosis, seroma and for length of time for surgery.
Results: We evaluated 359 female and 198 male patients with a mean age of 66 years. operated on 316 right and 241 left hips. we had 38 exclusions from the study, mainly due to incomplete data collection (26). For the cup we could find a mean difference of 1 for anteversion and inclination(max/min 13/-8 and 27/-14) and for the stem a a mean antetorsion of 16 and a lengthening of 5mm (max/min 22mm/-19mm). Complications were 1 dislocation, 3 thrombosis and 2 seroma.
Conclusion: Navigation of THR is a reliable tool. Outliners for the position of cup and stem are reduced, the dislocation rate is reduced. Duration of surgery was not increased in the second series due to routine application. Navigation could be combined with minimal invasive procedures.
Theses abstracts were prepared by Professor Roger Lemaire. Correspondence should be addressed to EFORT Central Office, Freihofstrasse 22, CH-8700 Küsnacht, Switzerland.
