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Revised AO/OTA classification (Jan 2018)

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.

2R2A Radius, simple fracture

2R2A1* Spiral fracture

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

2R2A2* Oblique fracture (≥30°)

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

2R2A3* Transverse fracture (<30°)

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

2U2A Ulna, simple fracture

2U2A1* Spiral fracture

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

2U2A2* Oblique fracture (≥30°)

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

2U2A3* Transverse fracture (<30°)

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

2R2B Radius, wedge fracture

2R2B2* Intact wedge fracture

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

2R2B3* Fragmentary wedge fracture

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

2U2B Ulna, wedge fracture

2U2B2* Intact wedge fracture

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

2U2B3* Fragmentary wedge fracture

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

2R2C Radius, multifragmentary fracture

2R2C2* Intact segmental fracture

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

2R2C3* Fragmentary segmental fracture

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

2U2C Ulna, multifragmentary fracture

2U2C2* Intact segmental fracture

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

2U2C3* Fragmentary segmental fracture

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

Executive Editor: Chris Colton

Authors: Dominik Heim, Shai Luria, Rami Mosheiff, Yoram Weil

Additional credits

Forearm shaft

Appendix

Note

X-rays need to show both the proximal and the distal joint in order to enable correct diagnosis of Monteggia and Galeazzi fractures.

See more details on radiographic examination.

Shortcuts

Decision support

Additional material

Further reading

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v2.0 2013-07-09