The hip joint is created by the junction between the femur (thigh bone) and the pelvis. The round femoral head articulates with the lower part of the pelvis, called the acetabulum (socket). The hip joint has a complex muscle anatomy which allows it to undergo significant stress in everyday activities, but also more importantly in extremes of motion. Stability of the hip joint is increased by the labrum (a cartilaginous ring around the socket), responsible for the suction seal effect in this ball and socket joint.
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