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Histological scoring system and fusion types according to scores
| Score | Histologic appearance |
|---|---|
| 7 | Only bone |
| 6 | Bone > fibrocartilage |
| 5 | Fibrocartilage > bone |
| 4 | Only fibrocartilage |
| 3 | Fibrocartilage > fibrous tissue |
| 2 | Fibrous tissue > fibrocartilage |
| 1 | Only fibrous tissue |
| 0 | Non-union |
| Fusion type | Fusion score |
| Fibrous | 0–2 |
| Fibrocartilaginous | 3–5 |
| Bony | 6–7 |
