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

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
Adapted from Strayer, SM, Reece, SG, Petrizzi, MJ. Fractures of the Proximal Fifth Metatarsal. American Family Physician 1999; 59:9.
Graphic 78785 Version 3.0