Fig. 4

A A 30-year-old man with a Tile C-type pelvic ring injury. B External fixation and iliosacral (IS) screw fixation on the day of injury. C Coronal reconstructed image showing a well-reduced posterior ring. D Post-injury radiograph at 4 weeks showing IS screw loosening. Definitive treatment was delayed due to unstable conditions of the patient with multiple trauma including aortic dissection. E Anterior plating 1-month post-injury. F Pelvic radiograph showing IS screw migration at 8 weeks post-injury. G Coronal image at 8 weeks post-injury showing vertically displaced sacral alar (arrow) and upward migration of right pelvis (white line). H Posterior transiliac plating was performed to acquire a more rigid fixation at 2 months post-injury