Abstract: Prosthetic cupule comprising:a metallic support cupule (6),a friction cupule in plastic material (20), of which the external shape corresponds to the internal shape of the support cupule,characterized in that:the support cupule (6) is provided in its center with an opening (14);the external shape of the friction cupule (20) comprises respectively a first cylindrical portion (22), joining up with a truncated portion (23), which is itself joined with a flat portion (25) provided in its center with a cylindrical central lug (24);and in that the internal face (21) of the friction cupule (6) is semi-spherical.