| Grade | Clinical Manifestations |
|---|---|
| Grade 0 | Foot at risk of ulceration, currently no ulcer |
| Grade 1 | Superficial ulcer, no clinical infection |
| Grade 2 | Deeper ulcer, often with soft tissue inflammation, no abscess or bone infection |
| Grade 3 | Deep infection, with bone involvement or abscess |
| Grade 4 | Localized gangrene (toe, heel, or forefoot) |
| Grade 5 | Whole foot gangrene |
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