Overview of re-operations in the series.
| Reason for Re-operation | n (%) | Time from Index Surgery (mo) |
| Clear pseudarthrosis | 3 (5.2%) | 11, 19, and 27 |
| Progressive cage subsidence | 1 (1.7%) | 2 |
| Foraminal stenosis at index level | 1 (1.7%) | 3 |
| Metal allergy reaction | 2 (3.4%) | 7 and 9 |
| Adjacent segment degeneration | 1 (1.7%) | 17 |
| Ongoing paina | 1 (1.7%) | 4 |
| Total | 9 (15.5%) | Not applicable |
↵a No subsidence or pseudarthrosis.