Classification

Type I: An undisplaced fracture of the radial head

Type II: A marginal radial head fracture with minimal displacement, depression, or angulation

Type III: A comminuted radial head fracture

Type IV: A radial head fracture with elbow dislocation

Explanation

In 1954, Mason proposed a classification system  in which he divided radial head fractures into three types; Johnston added a fourth type in 1962.

Figures 

Reference(s)

Provide the citation for the landmark article and recent review articles describing the classification

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