Pediatricians may discover a click or a clunk when performing a physical examination of the neonatal hip. Assessment for developmental dysplasia of the hip (DDH) is a routine part of the neonatal examination because failure to detect neonatal hip instability or to respond appropriately to an abnormal examination may result in long-term disability for the child.

Developmental dysplasia of the hip covers a wide range of diseases related to abnormal development of the acetabulum and femoral head. The primary cause of DDH is improper fetal or postnatal positioning, which limits contact between the femoral head and the acetabulum, hindering proper growth. The resulting spectrum of disease extends from subtle abnormalities detected only on imaging through more severe manifestations such as dislocated hips that are unstable at rest.

With the lack of a standardized definition and the uncertain clinical relevance of particular imaging findings, the true incidence of DDH remains unclear....

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