Shoulder prostheses comprising: a glenoidal component (12, 12 ', 12' ', 12' '', 12 '' '') that has a glenoidal joint surface (16, 16 ') and a humeral component (14) having a humeral joint surface (18), and a separate mobile glenohumeral bearing component (20, 20 ', 20' ', 20' '', 20 "'') comprising a glenoidal bearing surface (22, 22 ') and a humeral bearing surface (24, 24') arranged on opposite sides of the glenohumeral bearing component (20, 20 ', 20' ', 20' '', 20 "''), in which the surface of Glenoidal bearing (22, 22 ') is adapted to make contact, in an implanted state, with the glenoidal joint surface (16, 16') and in which the humeral bearing surface (24, 24 ') is adapted to make contact, in an implanted state, with the humeral joint surface (18), in which at least one of the glenoidal and humeral bearing surfaces (22, 22 ', 24, 24') is concave, in which the componentglenohumeral bearing (20, 20 ', 20' ', 20' ', 20 "' ') is adapted to be arranged, in an implanted state, between the glenoidal component (12, 12', 12", 12 '' ' , 12 "'') and the humeral component (14), and in which the glenoidal joint surface (16) is convex, characterized in that the humeral joint surface (18) is also convex.Prótesis de hombro que comprende: un componente glenoidal (12, 12', 12'', 12''', 12'''') que tiene una superficie de articulación glenoidal (16, 16') y un componente humeral (14) que tiene una superficie de articulación humeral (18), y un componente de cojinete glenohumeral móvil separado (20, 20', 20'', 20''', 20"'') que comprende una superficie de cojinete glenoidal (22, 22') y una superficie de cojinete humeral (24, 24') dispuestas en lados opuestos del componente de cojinete glenohumeral (20, 20', 20'', 20''', 20"''), en la que la superficie de cojinete glenoidal (22, 22') está adaptada para hacer contacto, en un estado implantado, con la superficie de articulación glenoidal (16, 16') y en la que la superficie de cojinete humeral (24, 24') está adaptada para hacer contac
