Table 2. Comparison of Degree of Displacement, Displacement Angle, and Disc Height Measured by Using a Lumbar Spinal X-ray Preoperatively and at the Postoperative Follow-ups.
| Variable | Preoperative | Postoperative | |||
|---|---|---|---|---|---|
| 1 yr | 3 yr | 5 yr | p-value | ||
| Degree of displacement (mm) | 5.1 ± 2.8 | 5.3 ± 1.7 | 5.7 ± 1.9 | 6.4 ± 2.0 | <0.05 |
| Displacement angle (°) | 6.7 ± 4.4 | 5.9 ± 3.4 | 6.1 ± 2.8 | 6.0 ± 2.5 | 0.182 |
| Disc height (mm) | 10.3 ± 3.4 | 9.7 ± 3.0 | 9.6 ± 2.4 | 9.4 ± 2.4 | 0.119 |
Values are presented as mean ± standard deviation.