|
| Anterior approach | Posterior approach | Number |
| DFI stage 1 | 3 | 15 | 18 |
| DFI stage 2 | 3 | 9 | 12 |
| DFI stage 3 | 24 | - | 24 |
| DFI stage 4 | 6 | - | 6 |
| Total | 36 | 24 | 60 |
| % | 60% | 40% | 100% |