Screw Placement | Fixation region | Total n (%) | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Thoracic | Lumbo-sacral | ||||||||||||
T9 | T10 | T11 | T12 | total | L1 | L2 | L3 | L4 | L5 | S1 | Total | ||
Correct | 7 | 10 | 12 | 19 | 48 | 16 | 20 | 33 | 72 | 71 | 26 | 238 | 286 (84.12) |
Violation | 3 | 4 | 8 | 7 | 22 | 4 | 6 | 7 | 10 | 3 | 2 | 32 | 54 (15.88) |
Total | 10 | 14 | 20 | 26 | 70 | 20 | 26 | 40 | 82 | 74 | 28 | 270 | 340 (100) |
Incidence rate of violation | 30 | 28.6 | 40 | 26.9 | 31.4 | 20 | 23.1 | 17.5 | 12.2 | 4.1 | 7.1 | 11.9 | 15.9 |
P value | 0.00007*** | ||||||||||||
χ2 | 15.94 |