Green and O'Brien classification of thumb metacarpal fractures
The Green and O'Brien classification of thumb metacarpal fractures is a commonly used classification system when assessing thumb metacarpal fractures.
However, since most types of fractures coincide with well-known eponymous fractures, the system itself is not usually used properly, giving preference to naming the types as the eponymous fractures themselves.
Classification
type I: simple intra-articular (Bennett fracture)
type II: comminuted intra-articular (Rolando fracture)
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type III: extra-articular, epibasal (pseudo-Bennett fracture)
IIIA: transverse
IIIB: oblique
type IV: epiphyseal fracture