Overview】Iliac dense osteitis is a non-specific inflammatory disease characterized by osteosclerosis, with highly dense osteosclerosis, especially in the lower 2/3 of the ilium, but no change in the joint space. It is also called “sacroiliac joint dense osteitis” because it is located in the sacroiliac joint and has significant symptoms in this joint. Iliac dense osteitis is a disease of increased bone density that occurs in the olecranon part of the iliac joint. The cause is unknown, but may be related to pregnancy, mechanical strain, or focal inflammation. The disease occurs in women of childbearing age between 20 and 35 years old, and occasionally in men. The etiology of the disease is more than 90% in middle-aged women. It is more common in late pregnancy, especially after childbirth, and can also be seen after chronic infection of the urinary tract or female adnexa, or other infections in the pelvis. In addition, trauma to the hip-sacral area can also trigger or cause this disease. Pathology】Pregnancy, childbirth and trauma can cause tearing of sacroiliac joint ligaments and easily block the local blood supply. Therefore, early local congestion, edema and increased exudation, etc., gradually local proliferation and degeneration, with the densification of collagen fibers to sclerosis; vascular formation of thick-walled vessels, easy to occlude and cause ischemia and hypoxia at the iliac auricular surface, the bone shows sclerotic changes, resulting in less local bleeding during surgery. The sacroiliac joint capsule wall shows fibrous hyperplasia, reduced elasticity and loosening-like changes. Similar pathological changes were also seen in patients with secondary inflammation in the pelvis, which may be caused by the action of bacterial endotoxin. Clinical manifestations and signs】Patients with lumbosacral pain, mostly chronic, intermittent soreness and vague pain, may spread to one or both buttocks and posterior thighs, but not radiating in the direction of sciatic nerve, aggravated after walking, standing, weight bearing and exertion, coughing and sneezing cannot aggravate the pain significantly, and the symptoms are relieved after rest. The patient’s lumbosacral angle increased, with local pressure pain and muscle tension, positive pelvic separation and squeeze test, positive “4” test, and laboratory tests were mostly within the normal range. x-ray examination, the sacroiliac joint gap was neat and clear, and the bone density of the iliac auricular joint part near the sacroiliac joint surface was increased, showing a dense zone of bone with uniform dense white edges and clear bony trabeculae. The bone trabeculae disappeared, and there was no bone destruction. Treatment principle] 1, the mild: to tight pants, some scholars report early taking shifting ginseng (white ginseng, 3 points per day, for 1 to 2 months) can be cured or improved, but not verified. 2, heavy: refers to affect walking and workers, feasible sacroiliac joint injection therapy, ineffective fusion of sacroiliac joint is feasible. Generally, only the upper joint fusion is needed, not the whole joint fusion, so as not to accidentally injure the superior gluteal artery and cause serious consequences. 3. Various non-surgical therapies, such as Chinese medicine, physical therapy, massage, acupuncture, fire cupping and non-steroidal anti-inflammatory drugs, can be used. 4. Gutta percha with fishy herb for the treatment of iliac dense osteitis.