Study Comparing Arthrodesis Technique of Thoracic and/or Lumbar Spine by Posterior Approach Performed by Robot-assisted Surgery (Robot Mazor X Stealth ™) Versus Conventional Surgery

Screws placement will be evaluated for each patient by a CT scan on D1 post-intervention. The evaluation of the placement of the screws (reading of the CT images) will be carried out by 2 radiologists independent of the surgical team, blinded to the technique used for the placement of the screws (robot-assisted/conventional surgery). In case of disagreement between the 2 evaluators, a 3rd evaluator will be requested.