Accuracy of pedicle screw insertion for unilateral open transforaminal lumbar interbody fusion: a side-by-side comparison of percutaneous and conventional open techniques in the same patients

Table 1 Characteristics of patients

Variables		P-side		O-side
Number of patients			181
Age (year ± SD)			69.0 ± 10.9
Gender	male		91
Gender	female		90
BMI (m/kg² ± SD)			24.1 ± 3.7
Fusion level	1-level		160
Fusion level	2-level		21
Pedicle screw level (No. of screw)
L2		2		2
L3		47		47
L4		141		141
L5		145		145
S1		48		48
Total		383		383
Screw total			766

PPS Percutaneous Pedicle screw, SD Standard deviation, BMI Body Mass Index, No Number, P-side PPS side, O-side Open side

ISSN: 1471-2474