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Kyphosis dorsalis juvenilis, the so-called apprentice or muscular kyphosis, is caused by disturbances in the vertebral epiphyses and not as originally suggested by muscular spinal insufficiency. The pathology resembles Calvé-Perthes osteochondritis deformans juvenilis coxae and can therefore be labelled as Osteochondritis deformans juvenilis dorsi.
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H. Scheuermann (1977) studied this question.
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