Instrument system for the operative correction of vertebral displacements

A correction and support device which has substantially the same outside diameter and pitch of an outside through-going thread as a predetermined perforated cylinder implant and which is intended to be introduced in its axial direction into a threaded hole in an intervertebral disc space of two neighbouring vertebrae, comprises an upper and a lower carrier part which both are provided for anchoring in the bordering vertebral bodies;

• whereby the upper and lower carrier parts are guided in a form-fitted manner with respect to one another in the axial direction for displacing one vertebra respectively to the other vertebra in axial direction;
• and whereby an integrated setting member consists of a setting screw which extends in the axial direction of the correction and support device, which is rotationally and axially fixedly journalled in the lower carrier part and which is in thread engagement with the upper carrier part, wherein the axial length of the upper carrier part, which is driven by the setting screw, is less than the axial length of the lower carrier part for enabling an axial displacement in both directions.