Stemless prosthesis anchor component

A shoulder assembly comprising:

• a shoulder prosthesis comprising:
• a base that is one piece and includes:
• a collar including:
• a plurality of apertures circumferentially spaced apart around the collar;
• and
• a plurality of notches circumferentially spaced apart around the collar;
• a body extending distally from the collar;
• a helical structure extending directly from and around the body;
• and
• an inner portion including a recess projecting distally from the collar to a distal end of the shoulder prosthesis, the recess extending through the body, wherein the plurality of apertures are shaped such that a length extending radially between the inner portion and an outer periphery of the collar is longer than a width extending perpendicular to the length;
• and
• the plurality of notches extend farther radially outward relative to the plurality of apertures;
• a first pathway projecting distally of the collar and through the helical structure adjacent to an inner periphery thereof, the first pathway being generally transverse to the helical structure and extending in a space between successive portions of the helical structure;
• and
• a locking device comprising a proximal support and a first arm projecting distally of the proximal support, the first arm configured to be disposed in the first pathway projecting distally of the collar when the proximal support is disposed adjacent to the collar;
• wherein the first arm is configured to be disposed through bone in the space between successive portions of the helical structure when the shoulder assembly is implanted;
• wherein the helical structure and the locking device comprise portions of a base plate assembly of a glenoid assembly, the locking device comprising a periphery configured to mate with an articular component of a reverse shoulder assembly.