Saturday, 9 February 2013

Mayo classification for olecranon fractures

Mayo Classification

The Mayo system describes fractures based on stability, displacement, and comminution.
Type I fractures are undisplaced, type II are displaced and stable, and type III are displaced and unstable. Each is divided into subtype A (noncomminuted) or B (comminuted).

Type I:
Undisplaced fractures: In an undisplaced fracture, it matters little whether a single fragment or several fragments are present; thus, non-comminuted (Type-IA) and comminuted (Type-IB) fractures may be considered to be essentially the same lesion.

Type II:
Displaced, stable fractures: In this pattern, the fracture fragments are displaced more than 3 mm, but the collateral ligaments are intact and the forearm is stable in relation to the humerus. The fracture may be either non-comminuted (Type IIA) or comminuted (Type IIB).

Type III:
Displaced, unstable fractures: The Type-III fracture is one in which the fracture fragments are displaced and the forearm is unstable in relation to the humerus. This injury is really a fracture-dislocation. It also may be either non-comminuted (Type IIIA) or comminuted (Type IIIB).

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