Table 3.
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 |