The clavicle is one of the most commonly fractured bones in the human body. In the skeletally immature patient, distal clavicle fractures are often mistaken for acromioclavicular joint injuries. Because the distal clavicle epiphysis is nonossified and not visible on radiographs, proximal clavicle displacement has the appearance of an acromioclavicular joint sprain. Prior studies have shown that most of these apparent acromioclavicular joint injuries are indeed fractures through the physis.A "duplicate" clavicle has been reported in the literature. The first reports were attributed to an embryological phenomenon. Ogden hypothesized that, "It is likely that these cases represent varying degrees of unrecognized antecedent trauma." This article documents the progression of a duplicate clavicle after an injury in a skeletally immature patient.
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