The hip bones, also known as the pelvic bones, form the base of the spine and support the upper body. Each hip bone consists of three parts: the ilium, ischium, and pubis. These bones connect at the acetabulum, which is the socket for the femur (thigh bone), allowing for movement at the hip joint. The hip bones play a crucial role in weight-bearing and mobility. They protect vital organs in the lower abdomen and support the attachment of muscles and ligaments. The structure of the hip bones also contributes to the overall shape of the pelvis, which varies between individuals.