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The hip is a ball-and-socket joint. This type of joint allows a good range of movement in any direction.
The ball of the hip joint is known as the femoral head, and is located at the top of the thigh bone (the femur). This rotates within a hollow, or socket, in the pelvis, called the acetabulum.
Hip replacement surgery involves removing parts of the hip joint that are causing problems – usually the ball and socket – and replacing them with new parts made from metal, plastic or ceramic.
Many thousands of people have hip replacement surgery each year. It usually brings great benefits in terms of reduced pain, improved mobility and a better quality of life.