Introduction and purpose: There is a controversy about the value and usefulness of the ultrasound screening of hips as well as about what population should be screened. It seems clear that ultrasound is the best method for early screening of developmental dysplasia in infants. The purpose of this paper is to assess the results of the semi-universal ultrasound screening of hips in infants.

Materials and methods: We evaluated the screening carried out of all girls and boys with risk factors delivered in our hospital (3/4 of those in the whole of Navarra) 1n 2001, 2002 and 2003. The number of newborns studied was 4144, 4199 and 4820 respectively. Ultrasounds were carried out when they were one month old. Diagnosed dysplasias accounted for between 6.19 and 6.27 per thousand newborns. Of all patients with diagnosed dysplasias, 4 girls (no boys) had to be operated on (adductor tenotomy and plaster cast).

Results and conclusions: The majority of diagnosed and treated dysplasias were found in breech babies, babies with a family history of the disease and especially in cases where there was no other sign suggesting the disease (only eight of them had had a positive Ortolani-Barlow). The lack of cases of late dysplasia has prompted us to rely on this type of screening since it has helped us reduce the amount of surgical procedures.