Foraminoplasty at the Tip or Base of the Superior Articular Process for Lateral Recess Stenosis in Percutaneous Endoscopic Lumbar Discectomy: A Multicenter, Retrospective, Controlled Study with 2-Year Follow-Up

Table 1

Summary of demographic and treatment level.

Baseline characteristic	Group A	Group B
Female gender (%)	43 (44.9)	49 (37.2)
Mean age (yrs) (range)	54.3 (45-65)	53.5 (52-68)
Treatment level
L3-4 (%)	12 (15.4)	15 (19.2)
L4-5 (%)	43 (55.1)	41 (52.6)
L5-S1 (%)	23 (29.5)	22 (28.2)

SAP: superior articular process.