Congenital hip dislocation after walking age.

Between 1940 and 1970, 107 patients more than 1 year of age with 134 congenitally dislocated hips were treated at the Alfred I. duPont Institute. It was found that after initial reduction 66% of hips reduced closed and approximately 30% of hips reduced open required further surgery. Good acetabular development was seen in 19% of hips reduced between 2 and 3 years, but only in 7% reduced after 3 years of age. The best results in the correction of residual dysplasia or subluxation were seen if correction was done before 6 years of age. Avascular necrosis was highest after simple open reduction and was responsible for most of the fair and poor results, with late development of poor femoral head coverage after an initial concentric reduction with good coverage.