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The pathological classification of osteonecrosis
| Grade | Histological changes |
|---|---|
| 0 | Normal histology |
| 1 | Proliferation of the fat cells and bone marrow oedema |
| 2 | Bone marrow necrosis without trabecular necrosis, cytolysis, karyorrhexis, karyolysis in the bone cells and bone marrow |
| 3 | Additional to the changes in grade 2, subchondral bone death, resorption and new / live bone formation surrounding the dead trabeculae |
