the Effect of Retrolaminar Block on Postoperative Pain

In recent years, as a part of multimodal analgesia, paravertebral blocks are replacing epidural analgesia due to the less side effects. Although the risk of pneumothorax is the most feared complication in paravertebral blocks, retrolaminar block (RLB) -which is a paravertebral block- significantly reduces this risk due to the anatomical technique of procedure. The investigators aim to investigate the effect of retrolaminar block with ultrasound- guided on perioperative analgesia for patients undergoing lumbar vertebra surgery.