Sternoclavicular (SC) injuries in skeletally immature patients can occur as a result of either a true sternoclavicular dislocation or a medial clavicular physeal separation. The medial clavicular physis is the last to ossify and can fuse as late as 25 years old, so physeal separations can occur in young adults as well. SC injuries are relatively uncommon and account for <1% of pediatric fractures. The clavicle more commonly displaces anteriorly to the sternum, but posterior displacement is more dangerous, as the posteriorly displaced clavicle can cause injury or compression to vital mediastinal structures (Figure 1).
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