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

Description

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: 43 (tibia/fibula, distal)

NOTE: This classification is similar that for the distal radius/ulna.

Locations:

(1) extra-articular fracture (A)

(2) partial articular fracture (B)

(3) complete articular fracture (C)

Extra-Articular Fracture	Type of Fracture	Fracture Code
extra-articular fracture, metaphyseal simple	spiral	A1.1
	oblique	A1.2
	transverse	A1.3
extra-articular fracture, metaphyseal wedge	postero-lateral impaction	A2.1
	antero-medial wedge	A2.2
	extending into the diaphysis	A2.3
extra-articular fracture, metaphyseal complex	3 intermediate fragments	A3.1
	4 or more intermediate fragments	A3.2
	extending into the diaphysis	A3.3

Partial Articular Fracture	Type of Fracture	Fracture Code
partial articular fracture, pure split	frontal	B1.1
	sagittal	B1.2
	metaphyseal multi-fragmentary	B1.3
partial articular fracture, split-depression	frontal	B2.1
	sagittal	B2.2
	of the central fragment	B2.3
partial articular fracture, multi-fragmentary depression	frontal	B3.1
	sagittal	B3.2
	metaphyseal multi-fragmentary	B3.3

Complete Articular Fracture	Type of Fracture	Fracture Code
complete articular fracture, articular simple, metaphyseal simple	without depression	C1.1
	with depression	C1.2
	extending into the diaphysis	C1.3
complete articular fracture, articular simple, metaphyseal multi-fragmentary	with asymmetric impaction	C2.1
	without asymmetric impaction	C2.2
	extending into the diaphysis	C2.3
complete articular fracture, multi-fragmentary	epiphyseal	C3.1
	epiphyseo-metaphyseal	C3.2
	epiphyseo-metaphyseo-diaphyseal	C3.3

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

Description

Specialty