[Sonography of the hip in infants].

Efficient hip-sonography requires adequate expertise of both patho-anatomy and technique. There are several problems concerning selection of patients, timing of the examination, technique, analysis of findings. The goal is early diagnosis of inhibited maturation or of dislocation of the hip-joint in order to begin treatment - if indicated - as early as possible. Thus therapy may be shortened and it gets less invasive. In future no gross hip-pathology should be detected for the first time after the age of three months.