Dorsal bayonet or "dinner fork" deformity.
(A) Typical distal metaphyseal fracture with dorsal bayonet showing a dorsal angulation of the distal forearm.
(B) Usually the periosteum is intact on the dorsal side and disrupted on the volar side.
Reproduced with permission from: Waters PM, Mih AD. Fractures of the distal radius and ulna. In: Rockwood and Wilkins' Fractures in Children, 6th ed, Beaty JH, Kasser JR (Eds), Lippincott Williams & Wilkins, Philadelphia 2006. Copyright © 2006 Lippincott Williams & Wilkins.
www.lww.com.