Comparison of unilateral and bilateral polymethylmethacrylate-augmented cannulated pedicle screw fixation for the management of lumbar spondylolisthesis with osteoporosis

Table 2 Comparison of the VAS between 2 groups preoperatively, immediately after surgery, and at final follow-up

Group	n	Preoperatively	Immediately after surgery	Final follow-up
UC	29	8.4 ± 1.1	2.5 ± 0.7*	2.2 ± 0.8, *
BC	21	8.0 ± 0.8	3.0 ± 0.4*	2.8 ± 0.5, , **
Statistics		t = 0.245, P = 0.756	t = 4.253, P = 0.076	t = 1.723, P = 0.546

VAS visual analog scale, UC unilateral PMMA-augmented CPSs, BC bilateral PMMA-augmented CPSs
Values presented are the mean ± SD
Significant if P < 0.05
*P < 0.05 vs. preoperatively values
**P < 0.05 vs. immediately after surgery values
***P > 0.05 vs. final follow-up values of the UC group

ISSN: 1749-799X