Modular joint spacer system

The invention relates to a modular Gelenkspacer system for screwing together a Gelenkspacers, which is provided for temporary replacement of an artificial joint, said Gelenkspacer system at least two via a screw (5, 6, 12) connectable modules (1, 2), wherein a first module (1) of the Gelenkspacer system has a surface for forming a sliding surface of the joint of the Gelenkspacers and a second module (2) of the Gelenkspacer system has a shaft for connection to a bone, in which via the screw (5, 6, 12) connectable modules (1, 2) for each screw (5, 6, 12) at least one screw lock (8, 18), wherein the at least one screw lock (8, 18) with one of the modules (1, 2) is connected or in one piece with a module (1, 2) is executed. The invention also relates to a method for constructing a joint spacer with such a joint spacer system, in which the joint spacer is screwed together from at least two modules (1, 2) which, depending on the anatomy and / or the treatment situation, are made up of a plurality of different modules (1, 2) are selected, wherein the modules (1, 2) are screwed together such that the screw locks (8, 18) prevents loosening or unscrewing the modules (1, 2). Finally, the invention relates to the use of a joint spacer made from such a joint spacer system as a temporary placeholder for an artificial joint.