Sonography in congenital deficiency of the femur.

Dynamic hip sonography was performed in 15 infants (19 hips) with congenital abnormalities of the hip. Radiographs of all 15 patients revealed congenital deficiency of the femur (CDF), type I-V, using the classification described by Kalamchi et al. Sonography was accurate in delineating hip position and morphology in all cases, and was a helpful adjunct to radiography in defining the hip joints in 13 hips with type II and type III deficiency of the femur.