Fig. 2

CT of patient NO.8 pre- and postoperatively at 3, 6 and 12 months. a Severe bone destruction on both sides of the joint; arrow indicates a rupture in the front of the sacroiliac joint capsule, with a sinus tract connecting to the abscess in the iliopsoas. b Ample bone graft in the lesion side and no obvious bone fusion 3 months after surgery. c Bone graft remodeling and no occurrence of bone absorption. d Solid joint fusion within 12 months after surgery