Effectiveness of Retrolaminar Block in Lumbar Spine Fusion With Multimodal Analgesia

Inclusion Criteria: * Adults aged 18-75 years, scheduled for lumbar spine fusion surgery by a trauma team * American Society of Anesthesiologists (ASA) Classification I-III * Willing and able to provide written informed consent to participate in the study. Exclusion Criteria: * History of chronic use of strong or weak opioids for more than 3 months. * Diagnosis of chronic pain and treatment by a pain management team. * ASA score greater than or equal to 4. * Patients with prior lumbar spine surgery. Spinal instrumentation at the surgical site. * Estimated creatinine clearance less than 60 ml/min. * Coagulation disorder or abnormal coagulation tests. * Infection at the surgical site. * Weight less than 50 kg. * Altered mental status that prevents reliable evaluation. * Allergy to local anesthetics or analgesic drugs used in the study. * Patients with contraindications to peripheral nerve blocks. * Lumbar spine fixation due to oncologic disease or acute trauma. * Use of intraoperative neuromonitoring and TIVA.