A glenoid component intended for securing to a glenoid surface of a scapula so as to provide a bearing surface for a head portion of a humerus, has a body portion with a first surface adapted to contact the glenoid surface of a scapula and a second surface configured to receive the head portion of the humerus. It has an anchor peg for penetrating the glenoid surface of the scapula so as to secure the body portion to the glenoid surface of the scapula. The anchor peg includes a cylindrical shaft extending from the first surface of the body portion and a fin secured to and extending outwardly from the cylindrical shaft. The fin includes at least one cutout configured to allow the fin to deflect outwardly along a hole in which the glenoid component is secured, thereby preventing rotation of the glenoid component. There can be first and second opposing cutouts, in which each of the cutouts includes a first leg and a second leg forming generally triangular cutouts.
