The invention relates to a joint implant comprising an upper and a lower implant part, which are connected to each other by at least one joint, wherein the upper implant part can be placed with a top side, and the lower implant part can be placed with a bottom side against bones to be connected to each other in an articulated manner and supported, wherein the upper and/or the lower implant parts each comprise a portion of the joint region providing the joint, and wherein a connecting means is provided which connects the upper and lower implant parts to each other to form a cohesive assembly, while enabling movement of the joint. According to the invention, each of the upper and/or lower implant parts comprises a contact part which faces the respective bone and can be attached thereto and which provides the top or bottom side of the implant, and further comprises a joint part which can be attached to the contact part and comprises the joint region of the implant part. As an alternative, or in addition, the connecting means extends substantially parallel to the implant longitudinal axis and is mounted in a holder of the joint region of the upper and/or lower implant parts, said holder being open on the bone side, wherein the holder can be covered at least partially or at least substantially fully by a cover element which can be displaced transversely to the implant longitudinal axis.
