The Accuracy of 3D Printing Assistance in the Spinal Deformity Surgery

Table 3

Number, type, and grading of pedicle screw breach.

	Medial breach	Lateral breach	Inferior breach	Anterior breach
Grade A	9	5	4	0
Grade B	3	0	1	0
Grade C	0	1	0	0
Total	12	6	5	0

Grade C: ≥4-mm breach. Grade A: <2-mm breach. Grade B: ≥2-mm breach and <4-mm breach.