Spinal surgery patients generally have chronic pain in the preoperative period and are exposed to widespread and severe acute pain postoperatively. In spinal surgery patients, providing postoperative analgesia is important not only for the patient's comfort but also for preventing the negative effects of pain on the systems, allowing early mobilization, reducing hospital stay and especially reducing chronic pain syndrome. Although ESP block is routinely used in spinal analgesia, the answer to the question of whether investigators should perform the block after putting the patient to sleep or before waking the patient after completing the surgery is not clear. Preference varies among anesthesiologists.YOU investigators propose a randomized double-blind study comparing patients who underwent ESP block before surgery (Group 1) with patients who underwent ESP block after surgery (Group 2).