A child with a diagnosis of Legg-Calvé-Perthes disease will exhibit:
A) Defective synthesis of type I collagen
B) Congenital dislocation of the acetabulofemoral joint
C) Necrosis of the proximal femoral head
D) Intoeing due to metatarsus adductus
Ans: C
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Legg-Calvé-Perthes disease is an idiopathic osteonecrotic disease of the proximal (capital) femoral epiphysis. DDH involves congenital dislocation of the acetabulofemoral joint, whereas defective synthesis of type I collagen accounts for the pathologic effects of osteogenesis imperfecta. Intoeing is neither a cause nor a consequence of Legg-Calvé-Perthes disease.
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