A prosthesis for a joint associated with a bone and at least one of an opposite natural component of the joint and an opposite prosthetic component of the joint, the prosthesis comprising: a rod (12) for coupling with the bone, including said stem a surface that defines a hole (16)； a joint component (20) that includes a support surface for its articular coupling with at least one of the opposite natural component of the joint and the opposite prosthetic component of the joint； and a mounting element (30) that includes a proximal portion (33) for coupling with the articulation component and that also includes a substantially solid articular portion (34) that can be received on the rod, which has a periphery contiguous and a spherical surface to allow movement of the mounting element with multiple degrees of freedom； wherein said hole (16) is subject to contact by the spherical surface of the substantially solid articular portion (34) of the mounting element (30) to allow movement of the mounting element, characterized in that said hole (16) it is tapered substantially uniformly, in which the substantially solid articular portion is configured to facilitate articular movement of the substantially solid articular portion within the hole when the adjacent periphery is not forcefully coupled with the opening, and the substantially solid articular portion and the hole are configured to firmly attach the mounting element to the rod when the adjacent periphery is tightly coupled with the hole.Una prótesis para una articulación asociada con un hueso y, al menos, uno de un componente natural opuesto de la articulación y un componente protésico opuesto de la articulación, comprendiendo la prótesis: un vástago (12) para el acoplamiento con el hueso, incluyendo dicho vástago una superficie que define un orificio (16)； un componente (20) de articulación que incluye una superficie de apoyo para su acoplamiento articular con al menos uno del componente natural opuesto de la articu
