Table 1 Demographics and baseline characteristics
Total (n = 78) | Group A (n = 30) | Group B (n = 48) | P-value | |||
|---|---|---|---|---|---|---|
s group (n = 21) | r group (n = 9) | s group (n = 30) | r group (n = 18) | |||
Gender | 0.535 | |||||
Male | 40 (53.1%) | 11 (52.4%) | 4 (44.4%) | 16 (53.3%) | 7 (38.9.6%) | |
Female | 38 (46.9%) | 10 (47.6%) | 5 (55.6%) | 14 (46.7%) | 11 (62.1%) | |
Age | 39.65 ± 13.08 | 33.57 ± 8.72 | 56.33 ± 5.79 | 30.97 ± 8.55 | 52.89 ± 5.83 | 0.151 |
Previous Diagnose | 0.312 | |||||
Fracture | 45 (57.8%) | 19 (90.5%) | 0 (0%) | 26 (86.7%) | 0 (0%) | |
Degenerative disease | 33 (42.2%) | 2 (9.5%) | 9 (100%) | 4 (13.3%) | 18 (100%) | |
Fixation range | 0.133 | |||||
Thoracic | 4 (5.1%) | 2 (9.5%) | 0 (0%) | 2 (6.6%) | 0 (0%) | |
Thoracolumbar | 38 (48.7%) | 11 (52.4%) | 3 (33.3%) | 17 (56.7%) | 5 (27.8%) | |
Lumbar/sacral | 36 (46.2%) | 8 (38.1) | 6 (66.7%) | 11 (36.7%) | 13 (72.2%) | |
Instrumentation construction | 0.165 | |||||
4-screw | 9 (11.5%) | 2 (9.5%) | 1 (11.1%) | 3 (10.0%) | 3 (16.7%) | |
6-screw | 25 (32.1%) | 7 (33.3%) | 2 (22.2%) | 12 (40.0%) | 4 (22.2%) | |
8-screw | 28 (35.9%) | 8 (38.1) | 4 (44..4%) | 11 (36.7%) | 5 (27.7%) | |
10-screw | 9 (11.5) | 2 (9.5%) | 1 (11.1%) | 3 (10%) | 3 (16.7) | |
12-screw | 5 (6.4%) | 1 (4.8%) | 1 (11.1%) | 1 (3.3%) | 2 (11.1%) | |
14-screw | 2 (2.6%) | 1 (4.8%) | 0 (0%) | 0 (0%) | 1 (5.6%) | |
Previous surgical procedure | 0.306 | |||||
Inner fixation only | 45 (57.8%) | 19 (90.5%) | 0 (0%) | 26 (86.7%) | 0 (0%) | |
Include fusion | 33 (42.2%) | 2 (9.5%) | 9 (100%) | 4 (13.3%) | 18 (100%) | |
Total retrieved screws | 588 | 160 | 70 | 214 | 144 | |
Screws with difficult removal | 116 (19.7%) | 28 (17.5%) | 15 (21.4%) | 41 (19.2%) | 32 (22.2%) | 0.817 |