Before we discuss what hip or femoral/acetabular impingement is, we need to understand the anatomy of the hip joint.
Anatomy of the hip joint
The hip joint is a ball and socket type joint. The ball refers to the head of the femur, also called the thigh bone, whereas the socket is the acetabulum, a special grooved part of the bone within the pelvis. The femoral head fits neatly into the socket. A ball and socket joint allows forward and backward movement plus side to side. It also allows internal and external rotation. Alongside these two bones is cartilage which helps to stabilize and facilitate hip movement.
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