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| Type | Description |
| 1 | Intact metaphyseal bone, contained defect |
| 2 | Cortical bone loss in metaphysis (uncontained) |
| A | 1 femoral condyle or tibial plateau |
| B | Both femoral condyles or tibial plateaus |
| 3 | Substantially deficient metaphysis |
AORI = Anderson Orthopaedic Research Institute.
