mason classification of radial head fractures
Type Description

I Fissure or marginal sector fractures with <2mm displacement

II Marginal sector fractures including <30% of the radial head with >2mm displacement

III All have comminutions involving the entire head of the radius, subtyped as

III A Fracture of the entire radial neck, with the head completely displaced from the shaft
III B Articular fracture involving the entire head, consisting of more than two large fragments
III C Fracture with a tilted and impacted articular segment

IV Comminuted fracture with elbow dislocation

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