Transverse Abdominis Plane Block for Anterior Approach Spine Surgery

Inclusion Criteria:

* Patient with age above 18 years old
* Patients scheduled for spine surgery by anterior approach
* Patient who signed an informed consent form

Exclusion Criteria:

* Allergy to ropivacaine
* Weight \< 50 kg
* Contra indication to TAP block : sepsis in the point of draining, bleeding disorder
* Contra indication to paracetamol: severe hepatic insufficiency
* Contra indication to ketoprofen: age ≥ 75 years, renal insufficiency, previous gastric ulcer, allergy
* Contra indication to nefopam: severe cardiac insufficiency, glaucoma, prostate hypertrophy, allergy
* Known allergy to active substance or at least to one excipient (propofol, paracetamol, morphine, remifentanil, cisatracurium)
* Allergy to fentanyl, atracurium, or benzin sulfonic acid derivative, to propacetamol
* Convulsions or previous convulsive disorder
* Severe respiratory insufficiency
* Abnormal hemostasis or anticoagulant treatment because of possible intramuscular injection
* Morphine intake 24 hours before surgery
* Chronic use of morphine, gabapentin, pregabalin
* Pregnancy or breastfeeding
* Patient unable to use Patient Controlled Analgesia (PCA) (old patient depends…)
* Patients subject to major legal protection (safeguarding justice, guardianship, trusteeship), persons deprived of liberty