The invention discloses a glenoid prosthesis baseplate, having a surface (1) for an artificial socket insert, an opposite fitting surface (2), and holes (2f) passing through the surfaces (1, 2), and feet (3) on the surface (1) for the artificial socket insert for fixing the artificial socket insert. The baseplate has at least two mounting tabs (4) connected to the edge (P) of the baseplate, and holes (4a) passing through each mounting tab (4), and the prosthesis baseplate is provided with at least two through holes (2f) passing through both the surface (1) for the artificial socket insert and the fitting surface (2), and each hole (2f) being in alignment with the axis of a through hole (4a) of the mounting tab (4).