Fig. 1From: Retrospective study of quadratus lumborum block for postoperative analgesia in patients undergoing percutaneous nephrolithotomySchematic illustration of the procedure of QLB-L (a: Pre-injection; b: Post-injection of local anesthetics) and QLB-TM (c: Pre-injection; d: Post-injection of local anesthetics). QL: Quadratus lumborum; PM: Psoas major muscle; ES:Erector spinae muscle; TP: Transverse process; LA: local anesthetics; Red arrow: tip of the stimuplex needle®Back to article page