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Cierny and Mader clinical staging system for adult chronic osteomyelitis28
| Anatomic type | |
| I | Medullary osteomyelitis |
| II | Superficial osteomyelitis |
| III | Localized osteomyelitis |
| IV | Diffuse osteomyelitis |
| Physiological Class | |
| A | Good immune system and delivery |
| B | Compromised locally (BL) or systemically (BS) |
| C | Requires suppressive or no treatment; minimal disability; treatment worse than disease; not a surgical candidate |
| Clinical Stage | |
| Type + Class = Clinical stage | |
