Score: Mason classification

Use: Radial head fractures

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

Reference

Classification and Diagnosis in Orthopaedic Trauma. Editors: Rahij Anwar, Kenneth W. R. Tuson, Shah Alam Khan. Cambridge University Press, 2008