CONGENITAL DISLOCATION OF THE HIP IN NORWAY Late Diagnosis CDH in the Years 1970 to 1974

Abstract

A survey of 274 late detected cases of CDH [congenital dislocation of the hip] born in the years 1970-74 is presented. The incidence of late cases in southeast Norway was calculated to 2.2/1000 live births. The hips of all patients were examined at birth without disclosing any hip affections. Of those examined, 86% were females. Only 6.9% were delivered in the breech position. Of the patients, 1/2 had luxation (20%) or subluxation (30%), the rest had dysplasia without dislocation. In 19% both hips were involved. The low incidence of breech presentations in the late CDH-cases compared with the incidence among neonatal cases (15.7%) point to some etiological differences. In Norway there apparently are 2 types of CDH, 1 caused by joint laxity and detectable at birth and another, not present at birth, with progressive dysplasia of the hip and dislocation developing during the 1st yr of life.