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Relationship between S1 screw loosening and bone fusion at L5–S1
| Bone fusion at L5–S1 | S1 screw loosening |
p-value | |
|---|---|---|---|
| Yes (n=6) | No (n=41) | ||
| Yes | 1 | 39 | <0.001* |
| No | 5 | 2 | |
Three cases were excluded in this analysis because of preoperative spontaneous fusion.
Statistically significant.
