Abnormalities of the sacroiliac joints in diffuse idiopathic skeletal hyperostosis: demonstration by computed tomography.

Eight patients with classical spinal radiographic features of diffuse idiopathic skeletal hyperostosis (DISH) had pelvic radiographs which suggested sacroiliac joint abnormalities. No patient had clinical features of ankylosing spondylitis. Computed tomography of the sacroiliac joints revealed several abnormalities including asymmetric intraarticular partial fusion, osteophytes with or without bridging, and vacuum phenomenon. Sacroiliac joint disease can complicate DISH.