Fig. 2
From: A novel biplanar positioning technique to guide iliosacral screw insertion: a retrospective study
Surgical application of the biplanar positioning technique. a-d The k1 was secured with tape and the k2 was placed in the iliac crest so that the two K-wires coincided at the inlet view to determine the PA. e–h Tape k3 and k4 so that the two K-wires coincide at the outlet view to determine PB. i-l Line ab was determined by fixing k3, k4, k5, and k6 with bone wax. Line ab was the line (k9) where the IS screw is correctly positioned. m–o The position of the guide needle was confirmed by fluoroscopy