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CT scan posterior fusion mass assessment scale
| Grade | Fusion status (interbody) | Criterias (axial cuts and coronal and longitudinal 2D reconstructions) |
|---|---|---|
| A-1 | Fused | Bridging bone (BB) >30% |
| A-2 | Probably fused | BB <30% |
| A-3 | Indeterminate | No BB or indeterminate BB |
| A-4 | Probably not fused | No BB + marginal lucencies |
| A-5 | Pseudarthrosis | Cystic lucencies, graft fragmentation, marginal lucencies on screws |
