Method of implanting glenoid anchor

A method of fixating a prosthesis to a glenoid, comprising

• drilling a stepped hole in a central portion of the glenoid;
• and
• inserting a stem of the prosthesis into a central portion of the stepped hole until at least one first deformable fin that encircles the stem engages cortical bone and at least one second deformable fin that encircles the stem engages cancellous bone, the prosthesis including a head portion having a first outwardly curved surface and an inwardly curved surface that is sized and configured to engage at least one of a humerus or a humeral component, wherein
• the stepped hole includes a proximal portion having a first diameter and a distal portion having a second diameter that is less than the first diameter, and
• the stem is formed from a first material and the head portion of the prosthesis is defined from a second material that is different from the first material.