Table 4.

Data of intervertebral space height (H) of patients among three groups

Parameters	Peroperation	Postoperation	3 months/postoperation	Last-follow up
BPS	9.28±1.96	11.63±1.55	11.52±1.51	11.43±1.45
UPS	9.31±1.9	11.66±1.61	11.56±1.62	11.32±1.53
UPSFS	9.30±1.85	11.59±1.49	11.50±1.54	11.39±1.60

No significant difference (P>0.05) existed between groups at any time, Significant difference (P<0.05) existed before and after operation. UPS=Unilateral pedicle screw, BPS=Bilateral pedicle screw, UPSFS=UPS plus contralateral translaminar facet screw