Inclusion Criteria:  American Society of Anesthesiologists (ASA) physical status I, II patients who will be scheduled for elective lumbar surgery for one or two levels. • Age range from 18 and 70 years.  Exclusion Criteria:  patient refusal.  significant renal, hepatic and cardiovascular diseases. History of allergy to one of the study drugs. Pregnancy. Any contraindication to regional anesthesia such as local infection or bleeding disorders. Chronic opioid use, history of chronic pain and cognitive disorders. Lumbar spine lesion revision.