Extended articular surface resurfacing head

A humeral head resurfacing implant comprising:

• a head including:
• an exterior hemispherical articulating surface defining a terminating rim, the terminating rim defines a rim plane extending from a first side of the terminating rim to a second side of the terminating rim;
• an interior concave surface opposite to the exterior articulating surface;
• and
• a first coupling mechanism proximate to the terminating rim;
• an anchoring stem coupled to the interior concave surface and extending along a stem axis that extends through an axial center of the head and through the rim plane, the stem axis is perpendicular to the rim plane;
• and
• a modular extended articulating flange protruding from only a portion of the head and extending across the rim plane when fastened to the head, the articulating flange includes a second coupling mechanism coupled to the first coupling mechanism to fasten the articulating flange to the head.

A method of resurfacing a humeral head of an implant site comprising:

• resurfacing the humeral head so as to form a generally spherical surface;
• selecting a modular extended articulation flange having a first coupling mechanism from a plurality of modular extended articulation flanges of different sizes;
• attaching the first coupling mechanism of the modular extended articulation flange to a second coupling mechanism proximate to a terminating rim of a resurfacing humeral head implant including an exterior hemispherical articulating surface defining the terminating rim and an interior concave surface opposite to the exterior articulating surface;
• and
• positioning the resurfacing humeral head implant on the resurfaced surface of the humeral head.