The pelvis is an important anatomical structure that consists of the sacrum and coccyx in the back and the hip bones on both sides, as well as ligaments, cartilage, and fascia to form a closed bony structure. The hip bone is composed of the iliac bone on both sides, the sit bones and the ulna in front, and the position of the pelvis has the role of bearing the top and the bottom. The weight of the human body is transmitted from the top to the bottom, and after the pelvis is dispersed, it is transmitted to the femur on both sides respectively, so that the force is dispersed and the pressure is reduced, and it is very important to maintain the normal shape of a person. In addition, there are important organs in the pelvic cavity, including the bladder, female uterus and rectum, and the pelvis protects the organs and maintains the normal function of the organs.