Table 2 Detail of removed pedicle screws
Screw characteristics | Overall (n = 236) |
|---|---|
Valid torque data | 226 (95.8%) |
Screw breakage | 4 (1.7%) |
Undetectable | 6 (2.5%) |
Thoracic spine | 86 (36.4%) |
t2-t9 | 38 (16.1%) |
t10 | 6 (2.5%) |
t11 | 10 (4.2%) |
t12 | 32 (13.6%) |
Lumbar spine | 138 (58.5%) |
l1 | 33 (14.0%) |
l2 | 38 (16.1%) |
l3 | 19 (8.1%) |
l4 | 24 (10.2%) |
l5 | 24 (10.2%) |
Sacral(S1) | 12 (5.1%) |
Polyaxial screw | 130 (55.1%) |
Monoaxial screw | 106 (44.9%) |
Short segment | 36 (9 patients) |
Multiple segments(≥ 3) | 200 (24 patients) |