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Staging of osteonecrosis
| Modified classification | |
|---|---|
| Stage 0 | Known involvement of one hip and suspected in the other |
| Stage 1 | Pain and limited movement with normal X-ray and positive MRI |
| Stage 2 | Sclerosis of the femoral head |
| Stage 3 | Subchondral fracture and flattening of the femoral head |
| Stage 4 | End-stage osteonecrosis with loss of the articular space and osteophyte formation |
