Posteromedial quadratus lumborum block versus transversus abdominal plane block for postoperative analgesia following laparoscopic colorectal surgery: A randomized controlled trial.

•The quadratus lumborum (QL) block has been reported to provide successful postoperative pain control for abdominal surgeries.•Pre-operatively subjects were randomized to a posteromedial QL block or lateral transversus abdominal plane (TAP) block.•The posteromedial QL block reduced postoperative morphine consumption and improved analgesia compared with the TAP block.•Moderate back pain close to the needle entry point might occur with the posteromedial approach to the QL block.•The QL block is superior for analgesia following laparoscopic colorectal surgery when compared to the TAP block.