Table 2.

Selection of studies with more than 50 patients and a breach rate <10% from Table 1

Author	Method of insertion	No. of screws (No. of patients)	No. of breached screws (rate, %)
Abumi et al.39)	Lateral fluoroscopy	669 (180)	45 (6.7)
Ito et al.43)	3D navigation (Iso-C3D)	176 (50)	5 (2.8)
Park et al.26,30,48)	Free-hand	979 (162)	38 (3.8)