Joint implant with an upper part and a lower implant part (2, 3) that are mutually joined by at least one joint, the upper part of the implant (2) being able to be placed and supported with an upper side (2a) and the lower part of implant (3) placed and supported with a lower side (3a) on respective bones to be joined in a mutually articulated manner, presenting the upper part and / or the lower part of implant (2, 3) joint areas (7 , 10) providing a respective part of the joint and being provided with joining means (4), which joins together the upper part and the lower part of implant (2, 3) forming a coherent subset and allowing an articulated movement, characterized in that the upper part and / or the lower part of the implant (2, 3) have a respective support part (5, 8), which is oriented towards the respective bone, can be fixed thereto and provides the upper and lower sides of the implant , and one articulation part (6, 9), which can be fixed to the support part (5, 8) and comprises the articulation area (7, 10) of the implant part, and because the joining means (4) is attached , so that it extends essentially parallel to the longitudinal axis (22) of the implant, in a housing (26, 27) of the articulation area (7, 10) of the upper and / or lower part of the implant (2, 3 ) which is open on the side of the bone, and because a covering element is provided that can travel transversely to the longitudinal axis (22) of the implant and covers, at least partially or at least essentially completely, the housing (26, 27) , and because the covering element is configured as a support part (5, 8) that can be placed in the bone and that supports the implant against the bone.Implante articular con una parte superior y una parte inferior de implante (2, 3) que están mutuamente unidas mediante, al menos, una articulación, pudiendo la parte superior de implante (2) colocarse y apoyarse con un lado superior (2a) y la parte inferior de implante (3) colocarse y apoyarse con un la
