Shoulder prosthetic

A shoulder implant assembly comprising:

• a humeral stem configured to be inserted into a humerus bone;
• a polymeric head including:
• a convex outer surface;
• a polymeric coupling taper;
• and
• a generally planar base;
• a cup having a concave surface configured to articulate with the polymeric head;
• and
• a taper adaptor configured to mate with the polymeric coupling taper of the head, the taper adaptor configured to connect the head to the stem when the cup is connected to a glenoid, and the taper adaptor configured to connect the head to the glenoid when the cup is connected to the humeral stem.

A shoulder implant assembly comprising:

• a humeral stem configured to be inserted into a humerus bone;
• a head including a metal substrate and a polymeric cover mounted to the metal substrate, the metal substrate including:
• a first base portion;
• a second base portion;
• a flange between the first base portion and the second base portion, the flange configured to secure the polymeric cover to the metal substrate;
• an anti-rotation layer on a side of the first base portion opposite to the flange;
• a coupling taper defined within the anti-rotation layer;
• and
• a plurality of tabs extending radially outward from the anti-rotation layer, the tabs configured to prevent the polymeric cover from rotating about the substrate;
• a cup including a unitary metallic base defining a concave articulating surface that is configured to articulate with the polymeric cover of the head;
• and
• a taper adaptor including a first male taper configured to mate with the coupling taper of the head and a second male taper configured to mate with the humeral stem, the first male taper is offset from the second male taper;
• wherein a first longitudinal axis extending through a center of the polymeric cover is parallel to and offset from a second longitudinal axis extending through a center of each of the coupling taper, the first base portion, and the second base portion;
• and
• wherein the polymeric cover is molded over the first base portion, the second base portion, and the flange, and is arranged between the tabs.