Exposure of both sacroiliac joints or sacrum. A, Skin incision. B, Posterior iliac crests, gluteus maximus muscles, and paraspinous muscles have been exposed. C, Outline of osteotomies of posterior superior iliac spines for application of plate and screws. D, Osteotomies have been performed, and gluteus maximus muscles have been reflected laterally. SEE TECHNIQUE 1.89.