Fig. 6From: Probability for surgical treatment in patients with lumbar spinal stenosis according to the stenotic lesion severity: a 5–10-year follow-up studyKaplan–Meier survival curve according to the grade of maximal foraminal stenosis. No significant difference was observed in the survival curve between grades 2 and 3 maximal foraminal stenosis (p = 0.830)Back to article page