ABSTRACT
In the past, DDH was known as congenital dislocation of the hip; however, there is now significant evidence that most hips are not dislocated at birth.1 It is for this reason that the term DDH is now used. In this chapter we will not discuss the relatively rare teratologic hip dislocation which occurs early in fetal life, presents as a fixed, high-riding dislocation at birth, and is often associated with syndromes or other congenital malformations or genetic disorders (see Chapter 27, Teratologic hip dislocation in multiple congenital contractures).
