It is significant for early detection of the lax hip at birth. The reason is that with a high expectancy of a normal hip as the outcome, it allows a relatively easy and safe treatment protocol. Progressively urgent dysplasia of both the acetabulum and the femoral head result from delay in diagnosis. On the other hand, the acetabulum and the femoral head leading to the require for more complicated management, consisting of the probable of a long surgical programme.
The precise aetiology is still unclear. In the first order relatives of CDH patients, there is a high incidence of both congenital joint laxity and of shallow acetabulum. There is a big variation in the geograpgical incidence of the situation.
In most European group, established, irreducible CDH, in the absence of a neonatal screening and cure programme is checked in about one point five per 1000 live births. The Island Lake Manitoba Indian community, who still use the cradleboard have a four per cent incidence of CDH. By contrast, the Lapps and the North American Indians, who swaddle their infants with the legs and the hips extended together, have a quite higher incidence.
Among ethnic groups, who take the infant with his legs astride the mother’s pelvis as in the Chinese and the black Africans, it is an uncommon situation. It is has an opposite attitude of this background. Beside that, it is thought that posturing the hips in subtotal abduction -in-flexion is believed to avoid the evolution of the lax neonatal hip into a whole built, irreducible dislocation.
Screening for neonatal hip laxity and cure by splintage is probable, with a well-limited programme, to decrease the incidence of late-diagnosis CDH.