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The hip joint is a large synovial socket and ball joint which is formed by the femoral head (the ball) and the acetabulum (the socket). The acetabulum is formed by pelvic bones; the ilium, the ischium and the pubis.   The hip joint represents the articulation between the lower extremity and the axial skeleton and allows a high degree of mobility while being stable.   The muscles of the hip consist of four main groups Gluteal group: the gluteus maximus, gluteus medius,