The importance of sonography and radiography in diagnosis and treatment of congenital dislocation of the hip.

The advantages of the sonography of the hip joint in the diagnosis and treatment of hip dysplasia in 1992 "policlinic" children and 1100 newborns are discussed and compared with radiological methods. The treatment concept at the Orthopädische Universitätsklinik Bonn is described as well as its modification after introduction of the sonography in the hip dysplasia screening-examination. These results confirm the necessity of making an early diagnosis. The osteonecrosis of the hip as a complication of the treatment of hip dislocation is discussed.