Fig. 1From: Safe surgical corridor for iliosacral screw placement in unstable pelvic fractures: a computed-tomography-guided validation study of the “triangulation method”The positional relationship of the SEP, the ASIS, and the greater trochanter The skin entry point of percutaneous S1 iliosacral screws showing an equilateral triangle relationship with the ASIS and the greater trochanter ASIS, anterior superior iliac spine; SEP, skin entry point; S1, first sacral vertebral bodyBack to article page