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.

14A1 Process, coracoid fracture

14A1 Scapula, process, coracoid fracture

14A2 Process, acromion fracture

14A2 Scapula, process, acromion fracture

14A3 Process, spine fracture

14A3 Scapula, process, spine fracture

14B1 Body, fracture exits the body at 2 or less points

14B1* Scapula, body, fracture exits the body at 2 or less points

Qualifications:
l - Lateral border fracture exit
m - Medial border fracture exit
s - Superior border fracture exit
g - Area immediately lateral to base of coracoid (glenoid side exit)
x - Coracoid P1
y - Acromion P2
z - Both processes P3

14B2 Body, fracture exits the body at 3 or more points

14B2* Scapula, body, fracture exits the body at 3 or more points

Qualifications:
l - Lateral border fracture exit
m - Medial border fracture exit
s - Superior border fracture exit
g - Area immediately lateral to base of coracoid (glenoid side exit)
x - Coracoid P1
y - Acromion P2
z - Both processes P3

14F0 Glenoid fossa, through the extraarticular subchondral bone of the glenoid fossa (glenoid neck)

14F0* Glenoid fossa, through the extraarticular subchondral bone of the glenoid fossa (glenoid neck)

Qualifications:
x - Coracoid P1
y - Acromion P2
z - Both processes P3

14F1 Glenoid fossa, simple fracture

14F1.1* Anterior rim fracture

Qualifications:
f - Infraequatorial rim fracture located in lower quadrant
r - Rim fracture anterior or posterior to maximum glenoid meridian with exits superior and inferior to the glenoid equatorial line
t - Fracture is located in two infraequatorial anterior and posterior quadrants with side of fracture defined by the center of fracture line
x - Coracoid P1
y - Acromion P2
z - Both processes P3

14F1.2* Posterior rim fracture

Qualifications:
f - Infraequatorial rim fracture located in lower quadrant
r - Rim fracture anterior or posterior to maximum glenoid meridian with exits superior and inferior to the glenoid equatorial line
t - Fracture is located in two infraequatorial anterior and posterior quadrants with side of fracture defined by the center of fracture line
x - Coracoid P1
y - Acromion P2
z - Both processes P3

14F1.3* Transverse or short oblique fracture

Qualifications:
i - Infraequatorial
e - Equatorial
p - Supraequatorial
x - Coracoid P1
y - Acromion P2
z - Both processes P3

14F2 Glenoid fossa, multifragmentary (three or more fracture lines)

14F2.1* Glenoid fossa fracture

Qualifications:
x - Coracoid P1
y - Acromion P2
z - Both processes P3

14F2.2* Central fracture dislocation

Qualifications:
x - Coracoid P1
y - Acromion P2
z - Both processes P3

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