Hyperextension or rotation of the ipsilateral arm may result in a proximal humeral or midshaft injury during birth.
Reproduced with permission from: Sarwark JF, King EC, Luhmann SJ. Proximal humerus, scalpula, and clavicle. In: Rockwood and Wilkins' Fractures in Children, 6th edition, Beaty JH, Kasser JR (Eds), Lippincott Williams & Wilkins 2006. Copyright © 2006 Lippincott Williams & Wilkins.
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