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Table 2 Evaluation of screw position according to vertebral level

From: Does a deep seated L5 vertebra position with respect to the iliac crests affect the accuracy of percutaneous pedicle screw placement at lumbosacral junction?

  At L5 At S1
Variable L5-S group L5-NS group P L5-S group L5-NS group P
Screw no. 68 40 - 68 40 -
 Grade 0 (%) 56 (82.4%) 31 (77.5%) 0.784 45 (66.2%) 30 (75.0%) 0.720
 Grade 1 (%) 10 (14.7%) 7 (17.5) 15 (22.1%) 7 (17.5%)
 Grade 2 (%) 2 (2.9%) 2 (5.0%) 7 (10.3) 3 (7.5%)
 Grade 3 (%) 0 (0.0%) 0 (0.0%) 1 (1.5%) 0 (0.0%)
Pedicle breach 12 9 - 23 10 -
 Lateral (%) 7 (10.3%) 6 (15.0%) 0.468 6 (8.8%) 7 (17.5%) 0.181
 Medial (%) 5 (7.4%) 3 (7.5%) 0.978 17 (25.0%) 3 (7.5%) 0.024
Mean SCA (°) 23.7° ± 7.4° 23.4° ± 10.6° 0.945 14.7° ± 5.8° 20.8° ± 5.2° 0.036