Abstract
Cementless fixation has become dominant for THR throughout the world, but are all stem geometries equivalent in results? Registries are the best source for studying this question because they are absent of personal bias. Results at 5 years allow separation of implants so this time frame was used. Comparing the same articulations (ceramic or metal-on- polyethylene), cementless stems with proximal enhancement (elliptical shape), or a tapered stem with rectangular cross section, have performed better than stems with a slim (blade) AP geometry. Almost all cementless stems reported to registries today are broached only tapered in design.
