Positive family history and girl sex might increase the risk of failure of abduction treatment in developmental dysplasia of the hip

Abstract Background. Known risk factors of DDH include female sex, family history and breech presentation. Abduction treatment fails more often with severe forms of DDH. Risk factors´ effects on abduction treatment failure are not well established. Material and methods. The children with DDH diagnosis treated in Tampere University hospital in the years 1998-2018 were retrospectively identified. Only the children with early evaluation (maximum 2 weeks of age) of pediatric surgeon or pediatric surgery resident were included in the analysis. Total of 761 children were included. Results. Family history of DDH and girl sex were associated with more severe forms of DDH, characterized by alpha angles under 50 degrees and/or major instability in dynamic ultrasound at one month of age. Conclusion. Family history of DDH and female sex increase the risk of more severe forms of DDH and thereby might increase the risk of abduction treatment failure.