Fig. 2From: Comparison of lumbar plexus block using the short axis in-plane method at the plane of the transverse process and at the articular process: a randomized controlled triala Schematic diagram of the probe placement and the puncture site in the beach chair method. b Ultrasound image and puncture passage of the beach chair method. TP, transverse process; LP, lumbar plexus; N, needleBack to article page