This chapter discusses two etiologically and clinically similar, but pathohistologically dissimilar groups of bone diseases. The first group of osteochondroses is basically characterized by ischemic osteonecrosis caused by trauma or physical injury and the second group is primarily associated with fracture of a developing apophysis or secondary ossification center in infancy and adolescence. The diseases of the first group include Legg-Calvé-Perthes disease, Friedrich’s disease, Freiberg’s disease, Kienböck’s disease, and osteochondrosis of the first metatarsal sesamoid, while those of the second group consist of Osgood-Schlatter disease, Scheuermann’s disease, Sever’s disease, slipped capital femoral epiphysis, and osteochondritis dissecans. A related disease is congenital dislocation of the hip that is caused by intrauterine deformity (Dunn 1976). It is to be mentioned that the actual existence of Sever’s disease of the calcaneal apophysis was once debated and even denied by some authors but it is an established entity (Madden and Mellion 1996; Volpon and de Calvalho 2002). As such, contrary to the earlier unitary concept of ischemic osteonecrosis, osteochondroses are currently recognized as a group of diseases the pathology of which is heterogeneous.
Slip Capital Femoral Epiphysis Metatarsal Head Osteochondritis Dissecans Congenital Dislocation Increase Tracer Uptake
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