Clinical Study
The Effect of Lumbar Lordosis on Screw Loosening in Dynesys Dynamic Stabilization: Four-Year Follow-Up with Computed Tomography
Table 3
Comparison of radiographic measurements in patients with S1 involvement.
| Characteristic | Screw loosening | value | Yes | No |
| Number of patients | 10 (28.8%) | 36 (71.2%) | | PI | 40.8 ± 12.1 | 41.6 ± 9.9 | 0.84 | LL | | | | Pre-op | 29.9 ± 12.2 | 26.6 ± 9.9 | 0.45 | Post-op | 30.3 ± 11.9 | 35.9 ± 11.3 | 0.20 | Delta (post-op minus pre-op) | 0.4 ± 12.5 | 9.3 ± 12.8 | 0.07 |
PI − LL | 10.9 ± 13.2 | 15.0 ± 12.1 | 0.39 |
|
|
Values are presented by mean ± SD. PI = pelvic incidence; LL = lumbar lordosis.
|