The hipbone has a socket called the acetabulum, which consists of three bones called the ischium, the ilium and the pubis, explains InnerBody. The head of the femur fits into the socket to make up a ball-and-socket joint. This architecture makes the hip bone strong and allows a wide range of movement. Other parts of the hipbone include the iliac crest, the ischial tuberosity and the superior ramus of the pubis. The iliac crest is the curved upper part of the ilium, the largest of the bones that make up the os coxa. The ischial tuberosity is inside the pelvis and supports the person when she sits.
The bones of the hip join together with ligaments such as the illiofemoral ligament, which is the strongest ligament in the body, the pubofemoral ligament and the sacrospinous ligament, reports InnerBody. Three powerful muscles envelop the hip joint: These are the large gluteus maximus, the gluteus medius, the iliopsoas and the sartorius muscles. The superior gemelius muscle and the rectus femoris muscle also stabilize the hip and help it move.Learn more about Bones