In the period between October 1990 and July 1992 58 newborn were ultrasonographically examined because of intrauterine breech presentation and therefore higher pressure on the fetal hips. These children were compared with other 66 children who had neither risk factors nor family disposition. We noted significant differences in the distribution of hip dislocation types (by Graf) between both groups. There was a normal distribution among the control group. Children in breech presentation, whether twin or single pregnancy, showed the following: (1) shift of the fine distribution to type Ia, (2) increase of type IIa, classified as pathological not before the 3rd month of life (type IIb, persistence of delay of ossification), (3) two hip dislocations type IIg, (4) one hip dislocation type IIIa. We recommend to perform ultrasound screening after delivery in all children who have had an intrauterine breech presentation, so that treatment can be started as soon as possible.
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