Fig. 2From: The feasibility for a novel minimally invasive surgery–percutaneous endoscopic transforaminal lumbar interbody fusion (PE-TLIF) for the treatment of lumbar degenerative diseases: a cadaveric experimentD Protection cannula. E Protection cannula under the anterior-posterior X-ray film. F Protection cannula under the lateral X-ray film. The hook-shaped device front is attached to the SAP (F1), then the SAP been taken out by the ring saw (F2)Back to article page