Despite general ultrasound screening of the newborn,congenital dysplasia and dislocation of the hip are still among the most common congenital skeletal diseases.A differentiated and stage-adjusted therapy must be the aim because inadequate therapy can lead to necrosis of the femoral head or a residual dysplasia that both require further treatment. Now as before a correct and early diagnosis is absolutely necessary for the treatment of dysplasia of the hip.A once treated hip should be observed until completion of growth.