Table 2.

AO Foundation/Orthopaedic Trauma Association classification and method of definitive fracture fixation for given Gustilo–Anderson grades of fracture

		AO/OTA classification		Mode of definitive fixation
		41	42	43	IMN	ORIF	Circular frame	Monolateral frame
Guidelines era	II	4	0	1	1	0	0	0
	IIIA	1	3	2	3	1	1	1
	IIIB	4	36	14	27	8	7	10
	IIIC	1	0	0	0	0	0	0
Standards era	II	0	5	1	6	0	1	0
	IIIA	1	6	1	6	1	0	1
	IIIB	0	14	2	10	1	5	0
	IIIC	1	1	2	0	0	0	1
Percentage of cases	Guidelines era	16	62	27	49	14	13	17
	Standards era	6	74	17	63	6	17	6