The fragment is rotated into a true AP view using the Schanz screw and drill, and the parallel alignment of the screw in relation to the joint surface is verified.
The Schanz screw is inserted almost to the medial aspect of the distal fragment, under image intensifier control.
Note: When the pin is inserted perpendicular to the humeral shaft but not in a true lateral trajectory it may perforate the cortex anteriorly on the ulnar side. This does not cause any problems if the perforation is no longer than 2-4 mm. Repositioning of the pin to correct such slightly oblique trajectories should be avoided.