Patients can know their pelvic size in the following ways: 1. Patients can measure the circumference of the hip by means of a quick measurement of the circumference of the pelvis by means of a tape measure or bandage strip, and they can have a general idea of the size of the pelvis. However, this measurement method is affected by soft tissues, and if the patient has abundant soft tissues, excessive fat or developed muscles in the buttocks, it may interfere with the measurement results. 2. Patients can measure by taking flat films, and they can take orthopantomographs and lateral films of the pelvis, and then ask the doctor to measure the left and right diameter and anterior and posterior diameter of the pelvis on the flat films to know the size of their pelvis relatively accurately. 3. 3. 3D reconstruction of the pelvis can be taken to accurately measure the size of the pelvis. A CT examination is required, and at a later stage, local synthesis is performed by computer software to make a three-dimensional image of the pelvis, so that each parameter of the pelvis can be accurately measured.