The hip is the body’s second largest weight bearing joint (after the knee). It is a ball and socket joint at the juncture between the leg and the pelvis. The rounded head of the femur forms a ball that fits into the acetabulum / socket of the pelvis. Ligaments connect the ball to the socket and provide tremendous stability to the hip joint. The synovial lining inside of the capsule nourishes and lubricates the joint. The various muscles which attach to or cover the hip joint generates the hip’s movements.