Fig. 3From: Probability for surgical treatment in patients with lumbar spinal stenosis according to the stenotic lesion severity: a 5–10-year follow-up studyThe number of surgical and conservative patients according to the grade of maximal foraminal stenosis on MRI. There was significant difference in the ratio of surgical patients according to the grade of maximal foraminal stenosis except between grades 0 and 1, and between grades 2 and 3Back to article page