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Table I: MRI grading scheme of femoral head physis
| Physeal grade | Fusion status |
|---|---|
| Grade 1 | Completely unfused (0%) |
| Grade 2 | Early fusion (1% to 25%) |
| Grade 3 | Moderate fusion (26% to 50%) |
| Grade 4 | High fusion (> 50%) |
| Grade 5 | Residual unfused physis (< 5 mm open on any slice) |
| Grade 6 | Completely fused (100%) |
