Clinical Study
The Effect of Lumbar Lordosis on Screw Loosening in Dynesys Dynamic Stabilization: Four-Year Follow-Up with Computed Tomography
Table 2
Comparison of patients with and without screw loosening.
| | Characteristic | Screw loosening | value | | Yes | No |
| | Number of patients | 42 (20.4%) | 164 (79.6%) | | | Age (year) | 64.6 ± 11.6 | 60.1 ± 13.1 | 0.03 | | Sex (F : M) | | | 0.99 | | Male | 23 | 92 | | | Female | 19 | 72 | | | BMI | 24.6 ± 3.2 | 25.6 ± 3.8 | 0.22 | | DM | 11/42 | 30/164 | 0.47 | | HTN | 16/42 | 75/164 | 0.47 | | Smoke | 3/42 | 15/164 | 0.92 | | Instrumentation | | | 0.48 | | 1 level | 15/42 | 71/164 | | | 2 levels | 27/42 | 135/164 | | | Blood loss (mL) | 822.6 ± 521.6 | 703.6 ± 544.5 | 0.22 | | Number of screws | 87 (8.2%) | 977 (91.8%) | | | Screw distribution | | | | | L2 | 0 (0%) | 12 (100%) | | | L3 | 16 (8.1%) | 182 (91.9%) | | | L4 | 24 (6.4%) | 352 (93.6%) | | | L5 | 32 (8.3%) | 354 (91.7%) | | | S1 | 15 (16.3%) | 77 (83.7%) | |
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Values are presented by mean ± SD.
BMI = body mass index; DM = diabetes mellitus; and HTN = hypertension.
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