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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Mohammadmain Rezazadehsaatlou[2].

Monteggia Fracture-Dislocations

Bado Classification for the Monteggia Fracture-Dislocations		Mechanism of Injury
Type I 60% of cases	Fracture of the proximal or middle third of the ulna with anterior dislocation of the radial head (most common in children and young adults)	(1) direct blow to posterior elbow (2) hyper-pronated force on an outstretched arm (3) contracted biceps resists forearm extension causing dislocation and followed by impact leading to ulna fracture
Type II 15% of cases	Fracture of the proximal or middle third of the ulna with posterior dislocation of the radial head (70 to 80% of adult Monteggia fractures)	(1) Axial load directed up the forearm with a slightly flexed elbow
Type III 20% of cases	Fracture of the ulnar metaphysis (distal to coronoid process) with lateral dislocation of the radial head	(1) Varus force on an extended elbow leads to a greenstick fracture of the ulna
Type IV 5% of cases	Fracture of the proximal or middle third of the ulna and radius with dislocation of the radial head in any direction	(1) Rarest type and poorly understood mechanism.

Jupiter Classification of Type II Monteggia Fracture-Dislocations
Type IIA	Coronoid level
Type IIB	Metaphyseal-diaphyseal junction
Type IIC	Distal to coronoid
Type IID	Fracture extending to distal half of ulna

Bado classification for Monteggia fractures

Related Chapters

• Monteggia fracture