Fig. 1From: Comparison of surgical invasiveness, hidden blood loss, and clinical outcome between unilateral biportal endoscopic and minimally invasive transforaminal lumbar interbody fusion for lumbar degenerative disease: a retrospective cohort studyIntraoperative view of BE-LIF. a: Skin dilator used to gradually expand the space and to establish observation and operative channels; b: Intraoperative view; C: Intervertebral bone grafting via an infundibular bone graft deviceBack to article page