Fig. 1From: Delta large-channel technique versus microscopy-assisted laminar fenestration decompression for lumbar spinal stenosis: a one-year prospective cohort studyAB Responsibility phase localization assisted by G-arm machine;Â C Intraoperative Delta large channel step-by-step working cannula;Â D Display decompressed and relaxed nerve roots under endoscope screen; E Length of surgical incision; F Hypertrophic ligamentum flavum tissue removed during surgeryBack to article page