An endoprosthesis for a joint, in particular a an intervertebral implant with a central axis, a top part, a bottom part and a joint provided between them, wherein the joint comprises at least two articular surfaces A and B that can slide on one another; the top part has a top apposed surface that intersects...http://www.google.com.au/patents/US20060212123?utm_source=gb-gplus-sharePatent US20060212123 - Articulated endoprosthesis
