Abstract: A device and method for measuring the position of an implant that is connected to at least one bone in a body. The bone has at least one bone marking, and the implant has at least one predetermined identifying mark. The device includes generators for generating radiation and for directing the radiation onto the at least one bone marking and the at least one predetermined identifying mark of the implant from various directions. The device also includes receivers for receiving a radiation image and an evaluation device for determining the position of the implant with respect to the bone on the basis of the radiation image received. The evaluation device is able to recognize the shape of the at least one bone and to locate at least one or more bone markings on the basis of one or more anatomically fixed points on the bone.