Grade 0
Minimal soft tissue damage, indirect violence, mild to moderate fracture

Grade 1
Superficial abrasion of contusion caused by pressure from within, mild to moderate fracture

Grade 2
Deep contamination abrasions associated with localised skin or muscle contusion, impending compartment syndrome, severe fracture

Grade 3
Extensive skin contusion or crushed, underlying severe muscle, decompensated compartment syndrome associated with major vascular injury, severe fracture