[The importance of the combination of the special x-ray with the arthrography in congenital displacement of the hip (author's transl)].

Arthrography is an important method of diagnosis of congenital displacement of the hip. It reveals the interposition of the soft tissue and the correctness of the position of the femur after a reduction of the hip joint. Arthrography only in a anterior posterior position cannot always demonstrate the real relationship between the femur and the pelvis. An x-ray of the arthrography in 45 degrees oblique position (Foramen obturatorium position) can reveal the situation.