Posterior shoulder arthroplasty implants, systems, and methods

A stemless humeral head replacement system comprising:

• a base plate comprising a bone facing side, an implant side opposite the bone facing side, a curvate perimeter, an implant engagement structure protruding from the implant side, and a first fin protruding from the bone facing side a first distance and extending linearly a length between side edges of the curvate perimeter wherein the base plate further includes a second fin protruding from the bone facing side extending linearly between side edges of the curvate perimeter, the second fin being generally parallel to the first fin;
• and
• a humeral head implant comprising a curvate implant surface and a base plate engagement structure opposite the curvate implant surface, the base plate engagement structure configured to couple to the implant engagement structure of the base plate;
• and
• a base plate delivery tool comprising a first engagement structure comprising a first pair of tips at a distal end and a first handle at a proximal end, each of the first pair of tips including a first protrusion configured to engage a portion of the base plate, the first engagement structure including a curvate flange configured to abut the curvate perimeter of the base plate when coupled thereto, the first engagement structure further including a bone engagement flange protruding beyond the curvate flange and configured to engage a bone portion when sliding the base plate onto a resected bone surface.

A stemless humeral head replacement system comprising:

• a base plate comprising a bone facing side, an implant side opposite the bone facing side, a curvate perimeter defining a central axis, an implant engagement structure on the implant side, and a first fin protruding from the bone facing side a first distance and extending linearly a length between side edges of the curvate perimeter, the first fin extending through the central axis;
• and
• a humeral head implant comprising a curvate implant surface and a base plate engagement structure opposite the curvate implant surface, the base plate engagement structure configured to couple to the implant engagement structure of the base plate;
• and
• a reference guide and a guide pin, the reference guide comprising a targeting arm having a curvate arm configured to be positioned around a spherical bone and terminating at a blunt tip, and a sleeve having a guide hole that is configured to guide the guide pin through the spherical bone to the blunt tip, wherein the reference guide further comprises a handle, the sleeve configured to removably couple with the handle, wherein upon delivery of the guide pin via guidance by the guide hole of the sleeve, the sleeve may be decoupled from the handle so as to permit the curvate arm of the targeting arm to be removed from being positioned around the spherical bone.

A stemless humeral head replacement system comprising:

• a base plate comprising a bone facing side, an implant side opposite the bone facing side, a curvate perimeter, an implant engagement structure protruding from the implant side, and a first fin protruding from the bone facing side a first distance and extending linearly a length between side edges of the curvate perimeter;
• and
• a humeral head implant comprising a curvate implant surface and a base plate engagement structure opposite the curvate implant surface, the base plate engagement structure configured to couple to the implant engagement structure of the base plate;
• and
• a reference guide and a guide pin, the reference guide comprising a targeting arm having a curvate arm configured to be positioned around a spherical bone and terminating at a blunt tip, and a sleeve having a guide hole that is configured to guide the guide pin through the spherical bone to the blunt tip, wherein the reference guide further comprises a handle, the sleeve configured to removably couple with the handle, wherein upon delivery of the guide pin via guidance by the guide hole of the sleeve, the sleeve may be decoupled from the handle so as to permit the curvate arm of the targeting arm to be removed from being positioned around the spherical bone.