Back pain measured by the visual analog scale (vas) or numeric pain scale at three months (6 - 20 weeks) postoperatively was greater than 3.0 and back pain measured by the visual analog scale (vas) or numeric pain scale within three months preoperatively and at three months (6 - 20 weeks) postoperatively demonstrated improvement of less than 5.0 points
back pain measured by the visual analog scale (vas) or numeric pain scale at three months (6 - 20 weeks) postoperatively was greater than 3.0 and back pain measured by the visual analog scale (vas) or numeric pain scale within three months preoperatively and at three months (6 - 20 weeks) postoperatively demonstrated improvement of less than 5.0 points
Bk pain vas 6-20wk > 3
bk pain vas 6-20wk > 3