Intraoperative anteroposterior fluoroscopic image of the pelvis. A, Note placement of thin curved osteotome just above anterior inferior iliac spine, directed toward open triradiate cartilage. B, Osteotomy continued toward the triradiate cartilage. C, Laminar spreader is used to open the completed osteotomy to the desired level of correction where it is stabilized while the graft is inserted. SEE TECHNIQUE 30.9.