[Results of sonographic hip examination of infants in a risk group].

During sonographic examination of 770 newborns and infants the diagnostic value and the possibility of valuation of singular risk factors were investigated. According our data an acetabular dysplasia, requiring treatment can be found most frequently in the background of a limitation of abduction motion. Pathologic alterations may be found less frequently in groups with familiar anamnesis and with breech presentation. It could be stated that the aspecific click is a clinical symptom of significance and cannot be neglected whereas we could not prove connections between asymmetry of the folds and the sonographic data. Our results prove that the anamnesis and the clinical symptoms alone do not make a perfect recognition of the dysplasia possible; in consequence it is suggested that sonography should be used as a screening.