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[Hip ultrasound evaluation in infancy: comparison with normal results].

We have reviewed more than a decade of clinical-echographical research in the developmental displasia of the hip (D.D.H.). We have examined 2050 small patients aged less than three months, with normal hips, and evaluated a number of ultrasound parameters that, in our opinion, may be helpful to give a description of hips particularly precise. We clearly underline that a precise definition, as more as possible, is a starting point to study all the pathological hips.