Frequency (%) of radiographic abnormalities over time.
| Time | No. of Hips | Joint Space Narrowing | Erosion | Growth Abnormalities | Subchondral Cysts | Malalignment | Sclerosis of Acetabulum | Avascular Necrosis |
|---|---|---|---|---|---|---|---|---|
| Baseline | 293 | 14.3 | 9.2 | 1.7 | 2.0 | 2.4 | 5.1 | 1.0 |
| Time 1 | 168 | 34.2 | 20.2 | 1.8 | 8.3 | 4.8 | 13.7 | 1.8 |
| Time 2 | 104 | 46.2 | 25.0 | 4.8 | 13.5 | 7.7 | 23.1 | 1.9 |
| Time 3 | 72 | 66.7 | 34.7 | 8.3 | 19.4 | 2.7 | 36.1 | 6.9 |