“…To achieve proper screw fixation, various authors have used fluoroscopy [9,20], computed tomography (CT) [9,12,17], fluoroscopic CT, and computer-assisted techniques [4,11,31]. Conventional fluoroscopy is the current standard for intraoperative observation [6,12,13,15,19,20]. Lateral sacral images in combination with the anteroposterior, inlet, and outlet views are necessary.…”