The classic: kyphosis dorsalis juvenilis.

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.