Table 1.

Bado Classification of Monteggia lesions including equivalent lesions

Bado classification	Direction of radial head dislocation	Ulnar fracture	Radial fracture	Incidence	Equivalents
I (Figure 6A)	Anterior	Diaphyseal, anterior angulation	–	60-70%	Isolated radial head dislocation Isolated radial neck fracture Disphyseal ulnar fracture with radial neck fracture Disphyseal ulnar fracture with fracture of the proximal third of radius Disphyseal ulnar and olecranon fracture with anterior dislocation of the radial head Disphyseal ulnar, posterior dislocation of the elbow +/− fracture of the proximal third of radius
II (Figure 6B)	Posterior or posterolateral	Diaphyseal, Posterior angulation	–	15%	Epiphyseal fracture of dislocated radial head.
III (Figure 6C)	Lateral or Anterolateral	Metaphysis	–	20%	–
IV (Figure 6D)	Anterior	Diaphyseal	Diaphyseal	1%	–