Glenoid adapter for shoulder joint prosthesis

The present invention relates to an improved glenoid adapter for shoulder prostheses, in particular for the conversion of an anatomic resurfacing prosthesis to a reverse shoulder prosthesis, comprising: *-at least one fixing projection (2) having an own axis (X) and being arranged to be fixed to the glenoid cavity (301) of the scapula (300) *-a flange (4) integral with said fixing projection (2); *-an attachment portion (3) integral with the flange (4) and extended in the direction opposite said fixing projection (2), as well as arranged to be coupled with an articular component (10) of reverse prosthesis provided with a convex articular surface (11), said attachment portion (3) having an own longitudinal axis (Y); both the fixing projection (2) and the attachment portion (3) have truncated-cone shape and that the axis of the attachment portion (Y) is misaligned with respect to the fixing projection axis (X); said flange (4) has a glenoid surface (4a) from which said fixing attachment (2) rises.