• Serkan Tulgar, Bahadir Ciftci, Ali Ahiskalioglu, Bora Bilal, Bayram Ufuk Sakul, Melike Girit, Tugce Akin, Madan Narayanan, and Haci Ahmet Alici.
• Samsun University Faculty of Medicine, Samsun Training and Research Hospital, Department of Anesthesiology and Reanimation, Samsun, Turkey.
• Pain Med. 2024 Mar 8.

Study ObjectiveWe report a novel block technique aimed to provide lumbosacral, abdominal and hip analgesia: The Quadro-iliac plane (QIP) block.DesignA cadaveric examination that evaluates the spread of QIP block.SettingCadaver laboratory.PatientsOne unembalmed cadaver.InterventionsBilateral ultrasound-guided QIP blocks on cadavers with 40 mL of methylene blue %0.5 each side.MeasurementsDye spread in cadaver.Main ResultsThere was staining in the deep interfascial plane of the erector spinae muscles. Extensive staining of the interfascial plane corresponding to the posterior aspect of the quadratus lumborum muscle (QLM) was observed. There was extensive staining on the anterior surface of the QLM. There was spread of dye traversing along the transversalis fascia and significantly infiltrating retroperitoneal fat tissue. Bilateral staining of the ilioinguinal and iliohypogastric nerves was observed. On the right, there was minimal staining over the subcostal nerve. There was dye present bilaterally within the deep regions of the transverse processes. The lumbar plexus was stained on both sides.ConclusionThe local anesthetic applied from a place where the QLM reaches its largest volume and the fascial plane creates a closed gap in the caudal area may exhibit a more rounded and extensive spread.Quadro-iliac plane block, involves the administration of local anesthetic to the posterior aspect of the QLM at its origin from the iliac crest. According to our cadaver study, this technique may be a promising option for alleviating acute and chronic pain in the lumbosacral, lower abdominal, and hip regions.© The Author(s) 2024. Published by Oxford University Press on behalf of the American Academy of Pain Medicine. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.

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