An acetabular cup assembly having a non-metallic inner cup to be positioned within a metal shell with a dome shaped interior surface. The non-metallic inner cup is formed with a plurality of interconnecting grooves and ribs. The ribs are configured to contact the interior surface of the metal shell while...http://www.google.es/patents/US5480448?utm_source=gb-gplus-sharePatente US5480448 - Acetabular cup groove insert
