An orthopedic prosthesis comprising a polymeric cup member for use in a
ball and socket joint is disclosed. The cup member may include several
advantageous features such as a multi-directional and multi-planar
channel having an undercut area that provides a mechanical lock between
the cup member and a fixation material for enhanced fixation. The cup
member may further comprise a plurality of spacers for ensuring an even
mantle of fixation material between the cup member and the bone, a series
of divots for enhancing fixation, a locating feature that permits a
physician to visualize and locate the cup member in the socket of the
patient's bone on appropriate medical equipment, and a lead-in chamfer
located between a terminal edge and an interior surface of the cup
member. Further, the terminal edge of the cup member may comprise a
planar rim or may alternatively comprise a hood located distally from
said terminal edge.