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 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.
This 3D model was created from the file STS_044. The source CT scan used to create this model can be found here.