Stemless shoulder implant

摘要

A humerus implant for a reverse shoulder prosthesis has a cup shaped body and a thread at the outside of the body. The thread has a plurality of fins with cutouts between the fins. At least one fin has an inclined leading surface which helps in incising into the bone by rotating the body in an inward direction. Furthermore at least one fin has a forward oriented undercut trailing surface blocking rotation in the outward direction.