An anchor device including an expansion section expandable when an expansion screw is screwed into the anchor device, and a tubular shank into which the expansion screw can be screwed. The anchor device has a joining device with an elongated offset element as well as a joining element. The first end of the offset element is connected to the tubular shank in such a way that the offset element extends essentially perpendicular to the tubular shank and to the expansion section. The second end of the offset element is connected to the first end of the joining element in such a way that the joining element extends essentially perpendicular to the offset element and essentially parallel to the tubular shank and to the expansion section.