The Riseborough and Radin classification of intercondylar fractures of the humerus can be used to classify this injury, which results from direct trauma to the olecranon as it is driven as a wedge between the humeral condyles 1.
Classification
Four types of fractures can be identified 1:
type I: no fragment displacement
type II: T-shaped intercondylar fractures with the trochlea and capitellum fragments separated but not appreciably rotated in the frontal plane
type III: T-shaped intercondylar fractures with separation of the fragments and significant rotatory deformity
type IV: T-shaped intercondylar fractures with severe comminution of the articular surface and wide separation of the humeral condyles
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