Table 2: Steinberg classification for hip osteonecrosis.
Stage | Radiographs | MRI |
---|---|---|
0 | Normal | Normal MRI and bone scan |
1 | Normal | Abnormal MRI and/or bone scan |
2 | Cystic/sclerotic changes | Abnormal MRI and/or bone scan |
3 | Crescent sign (subchondral collapse) | Abnormal MRI and/or bone scan |
4 | Flattening of femoral head | Abnormal MRI and/or bone scan |
5 | Narrowing of joint | Abnormal MRI and/or bone scan |
6 | Advanced degenerative changes | Abnormal MRI and/or bone scan |