A sacroiliac joint stitch is a small movement of the sacroiliac joint that does not reset on its own and causes pain and functional impairment. Sacroiliac joint stitch is also called sacroiliac joint subluxation. Many intractable lumbosacral pains are caused by this disease. Since there is no abnormality in the X-ray examination of this disease, it is easy to be missed and misdiagnosed clinically. The main clinical manifestations are: 1. pain in the lower back and bottom of the buttocks, and the pain is aggravated by the wrong position of lying on the side. 2. When the patient is standing, sitting or lying down, the patient takes the weight-bearing position on the healthy side and cannot bear weight on the affected side. 3.The knee and hip joint on the affected side are in semi-flexion position, and the pain is aggravated by passive straightening. 4.The affected sacroiliac joint may be swollen and elevated compared with the healthy side, and there is pressure pain and percussion pain at the inner lower corner of the posterior inferior iliac spine. 5.Pelvic orthopantomogram shows unequal height of pubic symphysis and unequal size of bilateral closed foramina. Treatment is based on American chiropractic or pulsed chiropractic treatment, supplemented by functional exercise, and usually a course of treatment can be recovered.