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Table 2 Comparison of the various parameters measured before and after surgery

From: Double-trajectory lumbar screw placement guided by a set of 3D-printed surgical guide templates: a cadaver study

Lumbar vertebral body Sagittal angle of the CBT screws (°) T-value P-value Axial angle of the CBT screws (°) T-value P-value Sagittal angle of the TPT screws (°) T-value P-value Axial angle of the TPT screws (°) T-value P-value
Preoperative Postoperative Preoperative Postoperative Preoperative Postoperative Preoperative Postoperative
L1 20.6 ± 1.1 19.9 ± 1.0 1.646 0.114 25.7 ± 0.9 24.9 ± 1.4 1.484 0.152 3.4 ± 0.8 3.2 ± 0.9 0.497 0.624 18.4 ± 2.7 19.3 ± 2.7 − 0.830 0.415
L2 17.9 ± 1.0 18.2 ± 1.4 − 0.534 0.599 21.7 ± 1.7 21.4 ± 1.6 0.465 0.646 3.3 ± 0.9 3.6 ± 0.9 −0.914 0.371 15.3 ± 3.2 14.6 ± 2.1 0.658 0.519
L3 19.2 ± 0.9 18.9 ± 0.9 1.004 0.326 20.9 ± 2.7 21.2 ± 2.1 −0.242 0.811 5.1 ± 0.6 4.9 ± 0.7 0.555 0.585 15.4 ± 1.0 15.0 ± 1.0 0.817 0.423
L4 17.3 ± 1.5 16.9 ± 1.4 0.827 0.417 25.6 ± 1.2 23.6 ± 3.5 1.935 0.066 11.2 ± 1.4 10.9 ± 1.5 0.366 0.718 18.6 ± 2.6 19.9 ± 2.2 −1.246 0.226
L5 19.5 ± 0.6 20.1 ± 1.0 − 1.710 0.101 27.9 ± 1.5 27.4 ± 1.2 0.926 0.365 11.0 ± 1.3 11.5 ± 1.5 − 0.985 0.335 19.9 ± 2.7 21.9 ± 2.6 −1.867 0.075