Humeral implant anchor system

A stemless humeral shoulder assembly, comprising:

• a mounting member of a shoulder joint articular interface component;
• and
• a base member including:
• a first end including a peripheral rim that encircles the first end and an inner member having an outside surface and an inside surface, the inside surface including an inner periphery of the base member, the inner member configured to receive and thereafter be located around an outside surface of the mounting member when the mounting member is advanced into the inner member of the base member;
• a second end configured to be embedded in a bone;
• at least one flat surface extending between the peripheral rim and the inner member, the at least one flat surface disposed at an elevation distal of a proximal-most aspect of the peripheral rim;
• and
• a plurality of spaced apart arms extending radially outward of the outside surface of the inner member, each of the plurality of spaced apart arms including (i) an outer edge and first and second lateral surfaces extending from the outer edge toward the outside surface of the inner member, (ii) a plurality of openings extending through the first and second lateral surfaces and open toward the outside surface of the inner member, and (iii) an inner edge spaced apart from the outside surface of the inner member,
• wherein the first and second lateral surfaces of each of the plurality of spaced apart arms are separated by a thickness, each of the first and second lateral surfaces extending from the second end of the base member toward the first end of the base member, each of the first and second lateral surfaces having a width measured in a radial direction, the width of each of the first and second lateral surfaces being greater than the thickness.