FIELD: medicine.
SUBSTANCE: preoperative planning is performed based on computer tomography. Based on the computer tomography performed, a markup map is created by creating a multiplanar reconstruction, on its basis an image is formed, where the trajectories of screws insertion, the distance between the points of screws insertion, the distance between the supraspinal ligament and the point on the screw trajectory at the same level are marked. On the formed markup map, the insertion points are determined intraoperatively, the deflection angle in the sagittal plane is determined from the side x-ray image and controlled by fixing the direction by installation of an additional spoke, and the deflection angle in the axial plane is determined indirectly, based on the distance from the apex of the spinous process - the supraspinal ligament determined on the markup map, the deflection angle in the axial plane is controlled by the distance to the apex of the spinous process - the supraspinal ligament, using a marking compass with a ruler, or a caliper.
EFFECT: method allows to reduce the radiation load, ensure the accuracy of the screw introduction.
7 dwg
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