Plain radiographs may be used but these may be difficult to interpret in the neonate due to the lack of appearance of the upper femoral epiphysis. In CDH, development of the upper femoral epiphysis tends to be delayed. There may be some pelvic asymmetry and various angles (acetabular) and lines (Perkin's) can be drawn in the absence of visualization of the upper femoral epiphysis to assess for acetabular dysplasia and congenital subluxation or dislocation.
Ultrasound with or without arthrography may also be helpful in assessing acetabular dysplasia with CDH and determining whether there is an inverted limbus or an hourglass constriction of the hip joint capitals.
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