"type I: non-displaced radial head fractures (or small marginal fractures), also known as a "chisel" fracture"
"type II: partial articular fractures with displacement (>2 mm)"
"type III: comminuted fractures involving the entire radial head"
"IIIa: fracture of the entire radial neck, with the head, completely displaced from the shaft"
"IIIb: articular fracture involving the entire head, consisting of more than two large fragments"
"IIIc: fracture with a tilted and impacted articular segment"
"type IV: fracture of the radial head with dislocation of the elbow joint"