Table 3 Reoperation rates of fusion surgeries according to anatomic regions
Postoperative time | Cervical fusion (n) | Cumulative cervical fusion (n) | Cumulative cervical reoperation rate | Lumbar fusion (n) | Cumulative lumbar fusion (n) | Cumulative lumbar reoperation rate |
|---|---|---|---|---|---|---|
 < 1 month | 15 | 15 | 0.13% | 66 | 66 | 0.22% |
1–2 months | 7 | 22 | 0.19% | 21 | 87 | 0.29% |
2–3 months | 7 | 29 | 0.25% | 10 | 97 | 0.32% |
3–6 months | 13 | 42 | 0.36% | 33 | 130 | 0.43% |
6 mo–1 yr | 9 | 51 | 0.43% | 23 | 153 | 0.51% |
1–2 yr | 28 | 79 | 0.67% | 93 | 246 | 0.81% |
2–3 yr | 89 | 168 | 1.43% | 248 | 494 | 1.63% |
3–4 yr | 78 | 246 | 2.09% | 230 | 724 | 2.39% |
 ≥ 4 yr | 28 | 274 | 2.33% | 105 | 829 | 2.74% |