Abstract
We seldom take an opportunity to treat a patient with arthritis of the sacroiliac joint, so it is difficult to diagnose it in early stage. we reported three cases of sacroiliitis: two cases of pyogenic arthritis and one of seronegative spondyloarthropathy due to Behcet disease. Two pyogenic cases were remissioned with intravenous injection of antibiotics, and in the case of Behcet disease, steroid was extremely effective among the treatment. Because of some different mechanisms of sacroiliitis, we tend to take a long time to make a diagnosis. Anyhow we should find out the cause of arthritis and take curative treatments as early as possible. And when you see a patient who complains severe pain on the buttock, you should take account of sacroiliac joint.
