Sacroiliac joint subluxation can be detected by specialist examination, orthopantomogram of the pelvis, CT of the pelvis (sacroiliac joint) and MRI of the pelvis (sacroiliac joint). 1. Specialized examination: when the sacroiliac joints are misaligned, the body is forced to take a position in order to relieve pain and other discomforts, and the examination shows that the buttocks and bilateral iliac crests are unequal in height, the gait is different when walking, and it is not possible to complete the flexion and extension movements or the movements are limited. 2. Pelvic X-ray: Pelvic X-ray is the most commonly used imaging examination to determine the misalignment of sacroiliac joints. X-ray examination can show the bony structural changes around the sacroiliac joints, narrowing of sacroiliac joints, and unequal heights of bilateral posterior iliac spines, or misalignment angle. 3. Pelvis (sacroiliac joint) CT: CT examination of pelvis or sacroiliac joint can find the signs of misalignment of sacroiliac joint and the degree of misalignment. 4. Pelvis (sacroiliac joint) MRI: MRI can clearly show the damage and edema of the ligaments and other soft tissues after the dislocation and then judge the dislocation, such as iliolumbar ligaments, sacroiliac ligaments, interosseous ligaments and other ligaments around the sacroiliac joint with irregular alignment, edema and so on. Detection of sacroiliac joint subluxation needs to be carried out in a medical institution.