Screening of children with congenital dislocation of the hip joint on the maternity wards in Sweden.

In Sweden screening for congenital dislocation of the hip joint (CDH) on the maternity wards was commenced in the 1950s. Of the estimated number of cases with CDH approximately 50% are diagnosed on the maternity wards and 80% during the first 6 months of life. Of the children "missed" at the primary screening on the maternity wards a substantial number have been premature babies treated at the intensive care unit postpartum. X-ray examination at the age of 1.5-3 months has been a helpful tool to reveal failure of early abduction treatment, which has been difficult to detect by clinical examination. Children with neonatal hip instability and a family history of CDH seem to represent a subgroup with an increased risk of failure of primary treatment and may need prolonged abduction treatment. The von Rosen splint has proved to be a reliable brace if used properly. If abduction treatment is commenced already during the first few days of life the risk for avascular necrosis is very low--1%.