ORTHOPEDIC PROSTHESIS HAVING ANTI-BACKOUT SCREW

摘要

An implantable orthopedic prosthesis (10) includes a screw (16) having a threaded shank (44) and a head (58). The head includes a plurality of splines (68) extending outwardly of the diametrical extend of the head. A first implantable prosthetic element (14) has a threaded bore (50) for receiving the threaded shank of the screw in threaded engagement. A second implantable prosthetic element (12) has a shoulder-stepped bore (52) for receiving the threaded shank therethrough and for engaging the head. The bore (52) includes an annular groove (62) for receiving the splines of the head and defines a shoulder (84) for engaging the splines to prevent backout of the screw.