1. Etiology What causes iliac dense osteitis? (a) The etiology of the disease is unknown. (B) pathogenesis unknown, may be related to pregnancy, trauma, infection and strain, the stability of the sacroiliac joint is affected during childbirth in women, the surrounding ligaments are relaxed, and the abnormal stress on the iliac bone itself and the joint is locally increased; coupled with the increase in the angle of inclination of the sacrum, the pelvis is tilted forward and down, the pull of the ligaments attached to the iliac bone affects the blood flow of the iliac bone, which reduces the local blood supply and causes bone Dense changes occur. What are the manifestations of iliac dense osteitis and how is it diagnosed? The main manifestations are pain in the lumbosacral region or lower back, occasionally radiating pain to the buttocks in the lower hip and posterior thigh, but not radicular pain radiating to the lower extremities, the patient’s body shape is plump and the lumbosacral angle is large, the sacral spine muscle is mostly in tension, the pelvic separation test and the “4” test are positive, the patient’s hematocrit is normal and there is no There is no bacterial inflammation. The diagnosis can be confirmed based on history, physical signs and imaging. What are the manifestations of iliac dense osteitis and how is it diagnosed? The main manifestations are pain in the lumbosacral or lower back, occasionally radiating pain to the buttocks in the lower hip and posterior thigh, but not radicular pain radiating to the lower extremities, the patient is plump and has a large lumbosacral angle, the sacrospinous muscle is mostly under tension, the pelvic separation test and the “4” test are positive, the patient has a normal hematocrit and no There is no bacterial inflammation. The diagnosis can be confirmed based on history, physical signs and imaging. 4. Complications How should iliac dense osteitis be prevented? No information is available.