Congenital dislocation of the knee reduced spontaneously or with minimal treatment.

Six cases of congenital dislocation of the knee (CDK) reduced spontaneously or with minimal treatment were investigated. Reduction was achieved from 4 days to 3 months after birth. Clinical results were good, although in four cases, hyperextension < or = 20 degrees persisted. In view of the perinatal complications and associated anomalies, CDK reduced with no or minimal treatment is supposed to be a category of congenital postural deformity. We believe that it is advisable to wait 1 month for spontaneous reduction of CDK in cases not associated with clubfoot, arthrogryposis multiplex congenita, and Larsen's syndrome.