The hip joint is formed by the socket (acetabulum) and the hip or femoral head (caput femoris), the acetabular cup is a part of the pelvis and the femoral head is a part of the thigh bone (femur). The femoral head is through the neck (collum) connected to the shaft of the femur. The hip joint is the link between the pelvis and the femur.
It concerns a so-called ball joint, which makes the upper leg relative to the pelvis to move. Substantially in all directions This makes it possible to move the upper leg with respect to the pelvis forward this is bending (flexion) referred to as the hip joint. The backward movement is called the stretch (extension). The upper leg of the pelvis discharging (outward movement) is put forward, and abduction of the upper leg relative to the pelvis (move inward) is referred to. Adduction Finally, the thigh can inwards (internal rotation) and outward (external rotation) are rotated.
The joint is surrounded by the joint capsule. The joint capsule is reinforced by ties. The movements of the hip joint are, in fact, limited only by the joint capsule. As a result, it is limited to 100 ° bending, stretching up to 20 ° C, the removal of up to 40 ° to 30 ° and the landing. In adults, it is turning inward and outward rotation of the thigh is limited to 30 °. Young children can rotate the thigh 50 ° inwards and outwards.