December 22, 1928


Author Affiliations


JAMA. 1928;91(25):1974-1976. doi:10.1001/jama.1928.02700250038010

The clavicle is one of the most frequently broken bones in the body. Statistics show that from 5 to 10 per cent of all fractures occur in the clavicle. Factors that contribute to this frequency are chiefly concerned with the anatomy of the parts as well as the position of the bone with reference to the trunk. This bone is the earliest to ossify in the body. Its primary center appears in the sixth fetal week and at birth the entire bone is ossified except the two extremities. The true epiphysis appears at the sternal end at from 15 to 18 years of age and unites usually at nearly 25 years of age. Despite this late union, epiphyseal separation is extremely rare, only one case having been reported (Heath). The early ossification of the bone, plus the unusually thick periosteum at a time when all other bones are flexible, makes

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