Skip to main content

Table 2 Detail of removed pedicle screws

From: Pedicle screw loosening: the value of radiological imagings and the identification of risk factors assessed by extraction torque during screw removal surgery

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)