Clinical Study

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

Figure 3

The base (left) or tip (right) of the ventral part of SAP was covered by the protective cannula at the lateral views of fluoroscopy.