The sacroiliac joint is created by connecting the sacrum to the iliac bones on either side. This joint is significantly less mobile than most joints in the body, but is vital to the stability of the body. The sacroiliac joint is located at the base of the spine and consists of a piece of sacrum and two iliac bones on either side, which are connected to each other by means of inter-articular cartilage. The mobility of the sacroiliac joint is less than that of joints in other parts of the body. Sacroiliac joint pathology occurs mostly in the elderly, with the degeneration of articular cartilage and repeated injuries to the sacroiliac joints, sacroiliitis and sacroiliac joint disorders can occur, in addition, for the presence of a combination of spinal degeneration, it is necessary to carry out the relevant examination as soon as possible. The sacroiliac joint has a strong stabilizing effect on the pelvis due to its tense joint capsule. In addition, it can support the spine and cushion the impact of the spine on the pelvis.