The AO-ASIF (Arbeitsgemeinschaft fur Osteosynthesefragen, Association for the Study of Internal Fixation) developed a classification system for fractures, based on location and type of fracture.
Code for location: 21 (radius/ulna, proximal)
Locations:
(1) extra-articular fracture (A)
(2) articular fracture of one bone (B)
(3) articular fracture of both bones (C)
Extra-Articular Fracture |
Type of Fracture |
Fracture Code |
fracture ulna, radius intact |
avulsion of the triceps insertion from the olecranon |
A1.1 |
|
metaphyseal simple |
A1.2 |
|
metaphyseal multi-fragmentary |
A1.3 |
fracture radius, ulna intact |
avulsion of the bicipital tuberosity of the radius |
A2.1 |
|
neck, simple |
A2.2 |
|
neck, multi-fragmentary |
A2.3 |
fractures both bones |
simple in both bones |
A3.1 |
|
simple in one, multi-fragmentary in other |
A3.2 |
|
multi-fragmentary in both |
A3.3 |
Articular Fracture of One Bone |
Type of Fracture |
Fracture Code |
fracture ulna, radius intact |
unifocal |
B1.1 |
|
bifocal, simple |
B1.2 |
|
bifocal, multifragmentary |
B1.3 |
fracture radius, ulna intact |
simple |
B2.1 |
|
multi-fragmentary, without depression |
B2.2 |
|
multi-fragmentary, with depression |
B2.3 |
articular fracture one bone, extra-articular fracture other bone |
ulna, articular simple |
B3.1 |
|
radius, articular simple |
B3.2 |
|
articular multi-fragmentary |
B3.3 |
Articular Fracture of Both Bones |
Type of Fracture |
Fracture Code |
both simple |
olecranon and head of radius |
C1.1 |
|
coronoid process and head of radius |
C1.2 |
|
NA |
NA |
one simple and other multi-fragmentary |
olecranon multi-fragmentary, radial head simple |
C2.1 |
|
olecranon simple, radial head multi-fragmentary |
C2.2 |
|
coronoid process simple, radial head multi-fragmentary |
C2.3 |
both multi-fragmentary |
three fragments of each bone |
C3.1 |
|
ulna with more than 3 fragments |
C3.2 |
|
radius, more than 3 fragments |
C3.3 |
Specialty: Surgery, orthopedic, Emergency Medicine, Critical Care, Surgery, general