Erector Spinae Plane Block in Lumbar Spinal Fusion

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.