Revised AO/OTA classification (Jan 2018)

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 Introduction
 12A1 Simple, spiral fracture
 12A2 Simple, oblique fracture (≥30°)
 12A3 Simple, transverse fracture (<30°)
 12B2 Intact wedge fracture
 12B3 Fragmentary wedge fracture
 12C2 Multifragmentary, intact segmental fracture
 12C3 Multifragmentary, fragmentary segmental fracture
Introduction

A revision of the AO/OTA Fracture and Dislocation Classification was published in the January 2018 issue of the Journal of Orthopaedic Trauma (Compendium and support material). This module is organized according to the 2007 version. Please read through its revised classification (below) before returning to the AO Surgery Reference.


12A1 Simple, spiral fracture

12A1* Simple, spiral fracture

*Qualifications:
a - Proximal 1/3
b - Middle 1/3
c - Distal 1/3


12A2 Simple, oblique fracture (≥30°)

12A2* Simple, oblique fracture (≥30°)

*Qualifications:
a - Proximal 1/3
b - Middle 1/3
c - Distal 1/3


12A3 Simple, transverse fracture (<30°)

12A3* Simple, transverse fracture (<30°)

*Qualifications:
a - Proximal 1/3
b - Middle 1/3
c - Distal 1/3


12B2 Intact wedge fracture

12B2* Intact wedge fracture

*Qualifications:
a - Proximal 1/3
b - Middle 1/3
c - Distal 1/3


12B3 Fragmentary wedge fracture

12B3* Fragmentary wedge fracture

*Qualifications:
a - Proximal 1/3
b - Middle 1/3
c - Distal 1/3


12C2 Multifragmentary, intact segmental fracture

12C2* Multifragmentary, intact segmental fracture

*Qualifications:
i - Proximal diaphyseal-metaphyseal
j - Pure diaphyseal
k - Distal diaphyseal-metaphyseal


12C3 Multifragmentary, fragmentary segmental fracture

12C3* Multifragmentary, fragmentary segmental fracture

*Qualifications:
i - Proximal diaphyseal-metaphyseal
j - Pure diaphyseal
k - Distal diaphyseal-metaphyseal