Classification of the AO-ASIF Group for Fractures of Proximal Tibia and Fibula

Extra-articular Fracture

Type of Fracture

Fracture Code

avulsion

of the fibular head

A1.1

of the tibial tuberosity

A1.2

of the cruciate insertion

A1.3

metaphyseal simple

oblique in the frontal plane

A2.1

oblique in the sagittal plane

A2.2

transverse

A2.3

metaphyseal multi-fragmentary

intact wedge

A3.1

fragmented wedge

A3.2

complex

A3.3

Partial Articular Fracture

Type of Fracture

Fracture Code

pure split

of the lateral surface

B1.1

of the medial surface

B1.2

oblique, involving the tibial spines and one of the surfaces

B1.3

pure depression

lateral total

B2.1

lateral limited

B2.2

medial

B2.3

split-depression

lateral

B3.1

medial

B3.2

oblique, involving the tibial spines and one of the surfaces

B3.3

Complete Articular Fracture

Type of Fracture

Fracture Code

articular simple, metaphyseal simple

slight displacement

C1.1

one condyle displaced

C1.2

both condyles displaced

C1.3

articular simple, metaphyseal multi-fragmentary

with an intact wedge

C2.1

with a fragmented wedge

C2.2

complex

C2.3

multi-fragmentary

lateral

C3.1

medial

C3.2

lateral and medial

C3.3