Torg system for classification of stress fractures of the proximal fifth metatarsal

Type I fractures (early)

No intramedullary sclerosis

Sharp, well-delineated fracture line

Minimal cortical hypertrophy

Fracture line generally involves only the lateral cortex (ie, does not extend to opposite cortex).

Type II fractures (delayed)

Widened fracture line that usually involves both cortices

Periosteal new bone adjacent to fracture line is prominent

Some intramedullary sclerosis present

Type III fractures (non-union)

Wide fracture line with periosteal new bone

Complete obliteration of medullary canal at the fracture site by sclerotic bone

Torg_system_classfication.htm

Adapted from Strayer, SM, Reece, SG, Petrizzi, MJ. Fractures of the Proximal Fifth Metatarsal. American Family Physician 1999; 59: 9.

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