Humeral head implant system

A humeral head implant system comprising:

• a humeral head component including a proximal convex articulating surface configured to articulate in a shoulder cavity, and a distal surface opposite the proximal convex articulating surface, a rim projecting distally from the distal surface of the humeral head component, a head cavity extending from the distal surface toward the proximal convex articulating surface;
• an adapter component having a proximal adapter surface and a distal adapter surface, the proximal adapter surface configured to be received within the head cavity so that the proximal adapter surface is oriented toward the proximal convex articulating surface and the distal adapter surface is oriented away from the proximal convex articulating surface, the distal adapter surface having a diameter that is larger than a diameter of the proximal adapter surface, an adapter cavity extending from the distal adapter surface toward the proximal adapter surface;
• a humeral base component including a circular proximal base surface configured to confront the distal surface of the humeral head component in an assembled condition of the humeral head implant system, and a distal extension for implantation into a humerus of a patient, a base cavity extending from the proximal base surface in a direction toward the distal extension;
• and
• a fastener extending from a proximal-most end to a distal-most end, the proximal-most end of the fastener having a width that is greater than a width of the distal-most end of the fastener, wherein in an assembled condition of the humeral head implant system, the proximal-most end of the fastener is received within adapter cavity and the distal-most end of the fastener is received within the base cavity to couple the adapter to the humeral base component.