(A) A fall on an outstretched hand with the elbow extended places a valgus stress on the forearm.
(B) This stress can cause a greenstick fracture of the olecranon with or without a radial neck fracture or medial epicondylar apophysis avulsion.
(C) Radiograph of a valgus extension fracture of the olecranon with an associated radial neck fracture.
Reproduced with permission from: Erickson M, Frick S. Fractures of the proximal radius and ulna. In: Rockwood and Wilkins' Fractures in Children, 7th ed, Beaty JH, Kasser JR (Eds), Lippincott Williams & Wilkins, Philadelphia 2010. Copyright © 2010 Lippincott Williams & Wilkins.
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