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Mason classification.
| Type I: Fissure fracture or marginal sector fracture without displacement (subchondral fracture or fracture involving a sector of the lateral quadrant of the radial head. |
| Type II: Marginal sector fractures with displacement – a segment of the lateral border of the radial head is separated, impacted, depressed or tilted out of line. |
| Type III: Comminuted fracture involving the whole of the radial head. |
