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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.

13A1 Extraarticular, avulsion fracture

13A1.1 Lateral epicondyle fracture

13A1.2 Medial epicondyle fracture

13A2 Extraarticular, simple fracture

13A2.1 Spiral fracture

13A2.2 Oblique fracture

13A2.3 Transverse fracture

13A3 Extraarticular, wedge or multifragmentary fracture

13A3.1* Intact wedge fracture

*Qualifications:
f – Lateral
h - Medial

13A3.2* Fragmentary wedge fracture

*Qualifications:
f – Lateral
h - Medial

13A3.3 Multifragmentary fracture

13B1 Partial articular, lateral sagittal fracture

13B1.1 Simple transtrochlear fracture

13B1.2* Capitellum fracture

*Qualifications:
q - Transcapitellar
r - Between capitellum and trochlea

13B1.3 Fragmentary transtrochlear fracture

13B2 Partial articular, medial sagittal fracture

13B2.1 Simple transtrochlear fracture through the trochlear groove

13B2.2 Simple transtrochlear fracture through the medial articular surface

13B2.3 Fragmentary transtrochlear fracture

13B3 Partial articular, frontal/coronal plane fracture

13B3.1 Capitellum fracture

13B3.2 Trochlea fracture

13B3.3 Capitellum and trochlea fracture

13C1 Complete, simple articular, simple metaphyseal fracture

13C1.1 Above the transcondylar axis

13C1.3 Through or below the transcondylar axis

13C2 Complete, simple articular, wedge or multifragmentary metaphyseal fracture

13C2.1* Intact wedge fracture

*Qualifications:
f - Lateral
h - Medial
u - Intact wedge

13C2.2* Fragmentary wedge fracture

*Qualifications:
f - Lateral
h - Medial
u - Intact wedge

13C2.3 Multifragmentary fracture

13C3 Complete, multifragmentary articular, simple, wedge or multifragmentary metaphyseal fracture

13C3.1* Simple metaphyseal fracture

*Qualifications:
s - Proximal to transcondylar axis
t - Distal to transcondylar axis

13C3.2* Wedge metaphyseal fracture

*Qualifications:
f - Lateral
h - Medial
l - Fragmentary
u - Intact wedge

13C3.3 Multifragmentary metaphyseal fracture

Executive Editor: Chris Colton

Authors: Mariusz Bonczar, Daniel Rikli, David Ring

Additional credits

Distal humerus

Appendix

Note

The goal of operative treatment is anatomical reduction and stable fixation, especially of any joint fragments, so that active motion can be started within a few days of surgery.

Treatment of pediatric fractures of the distal humerus is discussed in the Pediatric Trauma section of Surgery Reference.

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v1.0 2007-06-21