Inclusion Criteria:  Patient with medical insurance. Patient who received information about study and signes a consent to participate in the study. Major patient requiring a lumbar spinal fusion surgery. Patient with an ASA score of 1, 2 or 3.  Exclusion Criteria:  Minor patient. Patient with morphine intolerance Patient with allergy to local anesthetics. Patient consuming morphine for more than 3 months. Pregnant or breastfeeding patient. Patient scheduled for cancer surgery or trauma surgery. Patient participating in another interventional study. Patient with history of lumbar spinal fusion. Patient requiring lumbar surgery without arthrodesis. Patient requiring lumbar surgery with inter-lamar or inter-epineal stabilization. Patient refusing to sign the consent form. Patient for whom it is impossible to give informed information. Patient under the protection of justice, under curatorship or under tutorship.