Simple versus complex dorsal metacarpophalangeal dislocations of the thumb

Simple and complex dorsal dislocations of the thumb MCP joint. Simple dislocations (A) are in extension and reducible. Complex dislocations (B) are in bayonet apposition and are irreducible because of the interposed volar plate.

Reproduced with permission from: Kozin SH, Waters PM. Fractures and dislocations of the hand and carpus in children. In: Rockwood and Wilkins' Fractures in Children, 7th ed, Beaty JH, Kasser JR (Eds), Lippincott Williams & Wilkins, Philadelphia 2010. Copyright © 2010 Lippincott Williams & Wilkins. www.lww.com.

Graphic 62404 Version 11.0

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