The pubic bone is under the lower abdomen and inside the root of the thigh, and is the two bones in front of the pelvis, divided into the pubic body, the superior pubic branch, and the inferior pubic branch. The pubic bone constitutes the front and lower part of the hip bone, and the pubic bone accounts for two fifths of the hip bone. The upper edge of the superior pubic bone branch is connected to the arch line of the iliac bone backward, and the two pubic bones together form a round bulge forward, called the pubic tuberosity, which is an important symbol of the body surface. A sharp crest above the superior pubic branch moves backward to the arch line and forward to the pubic tuberosity, which is called the pubic comb. The oval rough surface on the inner side of the upper and lower branches of the pubic bone is called the pubic symphysis, and the pubic symphysis on both sides is connected with cartilage to form the pubic symphysis, and the large hole formed by the pubic bone and the sciatic bone is called the closed hole. The pubic body forms the front lower fifth of the acetabulum, and the rough surface of the upper edge of the bone at the union with the iliac body is called the iliac pubic ridge. Usually the pubic bone should be more protected in life to avoid fractures caused by external impact.