Fig. 1From: Comparative evaluation of posterior percutaneous endoscopy cervical discectomy using a 3.7 mm endoscope and a 6.9 mm endoscope for cervical disc herniation: a retrospective comparative cohort studyIntraoperative fluoroscopic images during p-PECD with 6.9 mm endoscope. a The lamino-facet junction is localized on anteroposterior view; b obturator is placed in the “V” point; c the working cannula is located over the “V” pointBack to article page