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A CT scoring system of the interbody fusion proposed by Goldschlager et al.
| Fusion grade | Description |
|---|---|
| Grade 0 | No new bone formation |
| Grade 1 | New bone formation but not continuous between C3 and C4 (cleft of discontinuity) |
| Grade 2 | Continuous bridging new bone but comprises < 30% of fusion area |
| Grade 3 | Continuous bridging new bone formation of > 30% of fusion area |
