The term 'Pelvis' is a bony structure located in the lower abdomen of humans and other vertebrates. It is composed of four bones, the sacrum, the coccyx, the ilium, and the pubis, which are connected by ligaments and muscles. The HIP joint is formed by the articulation of the head of the femur with the acetabulum of the pelvis. The HIP joint is a ball-and-socket joint that allows for movement in multiple directions.