We have many chances to treat a patient suffering from a low back pain and a leg pain, but we cannot diagnose the origin completely except a lumbar disc herniation. We reported the diagnosis and therapy of 19 patients who have pelvic ring instabilities. They visited our hospital with complaints of a low back pain and a leg pain from Nov. '88 to May, '90. They were treated conserva tively by intraarticular steroid injections in the sacro-iliac joints and pelvic fixation braces. The results were excellent in 8 cases, good in 6, fair in 2, and poor in 3.
