Table 5.
Number and relation of accidental durotomies and history of previous surgery.
| Durotomy | Previous surgery | Total | ||
|---|---|---|---|---|
| No | Yes | |||
| Levels operated | 357 | 125 | 482 | |
|
| ||||
| No | % without durotomy | 74.1% | 25.9% | 100% |
| % within group of previous surgery | 94.7% | 91.7% | ||
|
| ||||
| Levels operated | 20 | 12 | 32 | |
|
| ||||
| Yes | % with durotomy | 62.5% | 37.5% | 100% |
| % within group of previous surgery | 5.3% | 8.3% | ||
The two-tailed Fisher exact test showed no statistically significant relation between accidental durotomies and history of previous surgery in the level of MIS TLIF (P = 0.1535).