Fig. 7From: 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 studya The mean time of “V” point identification in the use of 3.7 mm endoscope and 6.9 mm endoscope was compared; b The mean time of the removed overlying tissue in the use of 3.7 mm endoscope and 6.9 mm endoscope was also comparedBack to article page