Could the Intraoperative Radiation Exposure (Fluoroscopy) of Percutaneous Pedicle Screw Fixation be Reduced Using an Electronic Conductivity Device?

Inclusion Criteria: * Men and women between 18 and 80 years-old; * Patient with an indication of PPTLO for one or two segments * Patient in a position to understand protocol information; * Patient who received information about the protocol and who did not show opposition to participate Exclusion Criteria: * History of posterior spinal fusion surgery on the spinal level concerned by the study; * Morbid obesity (body mass index greater than 35 kg / m²); * Major incapable (safeguard of justice, guardianship) and persons deprived of liberty. * Simultaneous participation in another research protocol involving the human person