Anterior quadratus lumborum block for postoperative recovery after total hip arthroplasty: a study protocol for a single-center double-blind randomized controlled trial

摘要

Ultrasound image of anterior quadratus lumborum block (QLB). Triangles indicate needles. : erector spinae muscle, local anesthetic, psoas major muscle, quadratus lumborum muscle, transversus process, vertebral body