Sacroiliitis – Grade 0 examples

(A) The sacroiliac joints are normal and are scored as grade 0. Note the thin white line on each side of the joints, indicating normal subchondral bone and the absence of sclerosis. There is no joint erosion, and no joint space widening or fusion is seen.
(B) The sacroiliac joints are normal and scored as grade 0. The lines bordering the joint space are not as clear-cut as in panel A. This is partly because the contrast in this image is less than that of panel A. In practice, it is recommended that the readers adjust the contrast of the images to arrive at the best resolution.