[Ultrasound control of the repositioning of hip dislocation in a child in the unstable phase of splint retention (Hanausek position)].

In CDH ultrasound control of reduction in the unstable period of the first 3 months has to be performed by an inguinal access, as the splint can not be removed for the reason of high risks of redislocation. Controls are possible whenever required, according to anglo-american techniques. Thus treatment within the first year of life may be controlled by ultrasound imaging alone. Criteria for detection of posterior and cranial redislocation as well as for the anterior positioning of the femoral head are given.