Internal fixation of a femoral neck fracture with a cannulated screw system. A, B, Reduction is confirmed, three parallel guide wires are placed using the guide and fluoroscopic control. C, Length of the wires is measured. D, Screws are inserted over the guide wires to the preselected depth (Permission from Swiontkowski MF. Intracapsular Hip Fractures. In Browner BD, Jupiter JB, Levine AM, Trafton PG, editor: Skeletal Trauma, Basic Science, Management and Reconstruction, 3rd ed. Philadelphia; Saunders; 2003, pp.1737)