Fig. 2

The IS screw fixation technique on C-arm images. A The guidewire was inserted through safe zone confirming with C-arm lateral view. B the guidewire was advanced through outer, inner cortex of ilium, and sacrum outer cortex. C The position of guidewire was confirmed in pelvis inlet view, and D outlet view. E Inserted screw was checked to avoid violation of S1 foramen on pelvis outlet view. F screw breach in AP direction was checked on pelvis inlet view