The double-headed femur.
D002648:Child; D002675:Child, Preschool; D005260:Female; D005270:Femur Head / Q000000981:diagnostic imaging*; D006618:Hip Dislocation, Congenital / Q000150:complications / Q000000981:diagnostic imaging / Q000601:surgery*; D006801:Humans; D007223:Infant; D011183:Postoperative Complications; D011859:Radiography