“…Many fixation methods are currently used to treat posterior pelvic ring injuries clinically (Sagi et al, 2004;Schildhauer et al, 2002Schildhauer et al, , 2003Yinger et al, 2003;Ziran et al, 2003;Vanderschot et al, 2001;Kobbe et al, 2012), and the iliosacral screw (ISS) technique (Ponsen et al, 2006) has been widely used (Cole et al, 1996;Shuler et al, 1995;Sciulli et al, 2007;Gardner & Chip Routt, 2010;Gardner et al, 2009;Zwingmann et al, 2010;Kim et al, 2012;Oh et al, 2008) because of its reliable fixation strength, small wound, decreased bleeding, and low infection rate. Mears & Velyvis (2003) described the pelvis as a "three-column structure."…”