Erector Spinae Plane Block vs Quadro-Iliac Plane Block After Lumbar Instrumentation Surgery

Lumbar instrumentation surgery is frequently associated with moderate to severe postoperative pain, which may negatively affect patient comfort, delay mobilization, and increase opioid consumption. Effective postoperative analgesia is therefore essential for improving recovery and reducing opioid-related adverse effects. Regional anesthesia techniques have become an important component of multimodal analgesia strategies in lumbar spine surgery. The Erector Spinae Plane Block (ESPB) is a well-established ultrasound-guided regional anesthesia technique that has been shown to provide postoperative analgesia in various spinal procedures. The Quadro-Iliac Plane Block (QIPB) is a newly developed ultrasound-guided block targeting the fascial plane between the erector spinae muscle and the quadratus lumborum muscle at the level of the iliac crest, with the potential to provide effective analgesia for lumbar spine surgeries. However, comparative clinical data regarding the analgesic effectiveness of these two techniques in lumbar instrumentation surgery are limited. This study is designed to compare the postoperative analgesic effectiveness of ultrasound-guided ESPB and QIPB in patients undergoing elective lumbar instrumentation surgery under general anesthesia. Both blocks will be performed using ultrasound guidance as part of a standardized multimodal analgesia protocol. The findings of this study aim to clarify the relative effectiveness of ESPB and QIPB for postoperative pain control following lumbar instrumentation surgery and to contribute to evidence-based selection of regional analgesia techniques in lumbar spine procedures.