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.

32A1 Simple, spiral fracture

32A1* Simple, spiral fracture

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

32A2 Simple, oblique fracture (≥30°)

32A2* Simple, oblique fracture (≥30°)

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

32A3 Simple, transverse fracture (<30°)

32A3* Simple, transverse fracture (<30°)

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

32B2 Intact wedge fracture

32B2* Intact wedge fracture

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

32B3 Fragmentary wedge fracture

32B3* Fragmentary wedge fracture

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

32C2 Multifragmentary, intact segmental fracture

32C2* Multifragmentary, intact segmental fracture

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

32C3 Multifragmentary, fragmentary segmental fracture

32C3* Multifragmentary, fragmentary segmental fracture

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