Subthalamic Nucleus Stimulation With Directional Leads on Patients With Parkinson Disease at Fluctuations and Dyskinesia Stage

Patients with subthalamic nucleus have to go through a lot of examinations and tests, before and after surgery which is difficult, sometimes painful, for the patient. The investigators used to chose the best plot of the leads for stimulation by a procedure long and exhausting for the patient and the examinator. The investigators can chose the plot using a software (Guide Xt), which can delete the exhausting test. The investigators would like to study the non inferiority of this tool to choose the best plot .