Fig. 3

Comparison of VAS score of low back and leg pain and ODI score between the OLIF-UPS and OLIF-BPS groups preoperatively (pre), 6 months (6 M), 12 months (12 M), Final follow-up(F fu) postoperatively. Data represents mean SD. Note: ns: the difference was not significant (P > 0.05). **:the difference was significant (P < 0.05).