| Grade 0 Lesion epithelialized | Grade 1 Wound superficial | Grade 2 Tendon involvement | Grade 3 Damage to the bone or joint |
Stage A No infection No ischemia | 0A | 1A | 2A | 3A |
Stage B Infection, but No ischemia | 0B | 1AB | 2B | 3B |
Stage C No infection But ischemia | 0C | 1C | 2C | 3C |
Stage D Infection and ischemia | 0D | 1D | 2D | 3D |