The investigators aim to compare the postoperative analgesic efficacy of the classical erector spinae plane block and the modified erector spinae plane block in the management of postoperative analgesia after lumbar disc surgery.
Patients aged 18-70 years,
Classified as ASA physical status I-III,
Scheduled to undergo single-level lumbar spinal surgery under general anesthesia
Who agree to participate in the study by providing written informed consent
History of bleeding diathesis or current anticoagulant therapy
Known allergy or hypersensitivity to local anesthetics or opioid medications
Infection at the planned block injection site
Previous lumbar spine surgery