IMAGING STRATEGIES IN THE FIRST 12 MONTHS AFTER REDUCTION OF DEVELOPMENTAL DISLOCATION OF THE HIP

We have reviewed the records of 32 infants whose developmental disloca tion of the hip (DDH) was treated by reduction and immobilization in a plaster cast. We examined 50 CT scans from 22 patients. The postreduc tion radiological studies led to a change of cast in 10 patients and, in five of them, the subluxation shown on CT scan was not seen in an e arlier radiograph. Where reduction has been undertaken at the time of arthrography or in an older child, a plain radiograph may be adequate to confirm the position in the cast. In an infant, CT scans give super ior information, have acceptable risks, and should be used in associat ion with radiation protection measures.