Fig. 3From: Comparison of the total and hidden blood loss in patients undergoing single-level open and unilateral biportal endoscopic transforaminal lumbar interbody fusion: a retrospective case control studyThe propotion of patients with anaemia in 2 groups. Open transforaminal lumbar interbody fusion, O-TLIF; Unilateral biportal endoscopic transforaminal lumbar interbody fusion, ULIFBack to article page