Ultrasound visualization of the anatomy relevant for lumbar plexus block: comparison of the paramedian transverse and Shamrock scan technique

Ultrasound-guided (USG) lumbar plexus block (LPB) is considered an advanced regional anesthetic technique[1][1] because the plexus is located at a depth[2][2] and ultrasound visualization of the anatomy can be difficult.[3–5][3] Several different techniques have been described for USG LPB,[3 4 6][