In clinical practice, the presence or absence of misalignment of the sacroiliac joint is generally determined in the following ways: 1. Ask the patient if there is any history of relevant trauma, such as any direct violent blow against the sacroiliac joint, any fall from height, and any injury involving pulling or twisting of the lower limbs. 2. After asking the medical history, a comprehensive physical examination of the patient should be conducted, and for this area, we should look for There is no pressure pain or percussion pain around the sacroiliac joint. In addition, specific tests should be done, such as the 4-character test of the lower limbs and the tension test of the pear-shaped muscle. When doing this type of test, if there is obvious pain around the sacroiliac joint, it suggests that there may be problems with the sacroiliac joint.3. After doing the above tests, you also need to do the corresponding auxiliary tests. According to the specific situation of the patient, plain film, CT, MRI and other examinations around the sacroiliac joint can be chosen. Generally through the above three steps of examination, the presence of sacroiliac joint misalignment can be clarified.