Table 5.
Comparison of the postoperative changes between patients with and without adjacent segment degeneration
| Variable | Patients with adjacent segment degeneration | Patients without adjacent segment degeneration | p value |
|---|---|---|---|
| SL (°)* | 17.2 ± 6.6 | 18.1 ± 7.6 | 0.47 |
| WL (°)* | 48.7 ± 10.5 | 53.6 ± 7.4 | 0.07 |
| Cr-SL (°)* | 19.8 ± 5.4 | 18.0 ± 6.7 | 0.12 |
| Ca-SL (°)* | 16.9 ± 8.5 | 17.6 ± 7.7 | 0.58 |
| DH (mm)* | 12.6 ± 1.6 | 12.5 ± 2.6 | 0.89 |
| Cr-DH (mm)* | 11.9 ± 1.6 | 11.9 ± 1.9 | 0.79 |
| Ca-DH (mm)* | 10.7 ± 1.9 | 12.0 ± 2.4 | 0.45 |
| Cr-FA (°)* | |||
| L4–L5 | 33.7 ± 10.5 | 38.5 ± 12.2 | 0.18 |
| L5–S1 | 45.6 ± 10.9 | 47.3 ± 11.9 | 0.72 |
| Ca-FA (°)* | |||
| L4–L5 | 47.1 ± 9.2 | 46.3 ± 11.3 | 0.34 |
| Cr-FD < 2 (number of patients) | 5 | 20 | 0.02 |
| Cr-FD ≥ 2 (number of patients) | 14 | 10 | |
| Ca-FD < 2 (number of patients) | 3 | 7 | 1.00 |
| Ca-FD ≥ 2 (number of patients) | 7 | 12 | |
| Cr-DD < 3 (number of patients) | 2 | 4 | 1.00 |
| Ca-FD ≥ 3 (number of patients) | 17 | 26 | |
| Ca-DD < 3 (number of patients) | 2 | 4 | 1.00 |
| Ca-DD ≥ 3 (number of patients) | 8 | 15 | |
| Cranial facet violation by screw (number of patients) | 8 (42.1%) | 16 (53.3%) | 0.09 |
| VAS score (points)* | |||
| Back | 3.3 ± 3.3 | 3.1 ± 2.3 | 0.89 |
| Leg | 1.4 ± 2.7 | 2.5 ± 2.9 | 0.11 |
| ODI (%)* | 17.2 ± 15.5 | 18.9 ± 16.3 | 0.41 |
| Satisfaction rate (%)* | 84.6 ± 17.6 | 82.1 ± 16.6 | 0.37 |
* Values are expressed as mean ± SD; SL = segmental lordosis; WL = whole lumbar lordosis; DH = disc height; Cr = cranial segment; Ca = caudal segment; FA = facet angle; FD = facet degeneration grade; DD = disc degeneration grade; ODI = Oswestry Disability Index.