To assess the degree of ossification of the medial
clavicular epiphyses, a classification into four stages was
applied [10]:
Stage 1: The ossification center has not ossified.
Stage 2: The ossification center has ossified, the epiphyseal
cartilage has not ossified.
Stage 3: The epiphyseal cartilage is partially ossified.
Stage 4: The epiphyseal cartilage is fully ossified.