Analysis of Gait Before and After Botulinum Toxin Treatment in Patients With Focal Dystonia

Inclusion Criteria: * speaking French, in the ability to understand clinical tests and explorations, * in ability to move to the CHU Grenoble Alpes * Diagnosis of cervical dystonia or isolated Blepharospasm, * Absence of neurological or psychiatric disorders, * Affiliation to a health insurance, * Signed consent fo the subject. Exclusion Criteria: * Pregnant women (positive pregnancy test), parturient or breastfeeding * Cervical dystonia or Blepharospasm of secondary origin * subjects having benefited from deep brain stimulation, * History of other pathologies that may lead to walking disorders, inability to walk without technical assistance, inability to walk for more than 10 minutes, * Subjects receiving botulinum toxin treatment for another cause. Prohibited treatments and procedures: * Antecedent of pathologies that may cause walking disorders * Simultaneous participation in another Interventional study * Subject in time of exclusion from another study * Subject under guardianship or having curators (major protected) * Subject under administrative or judicial supervision * Subject not able to be contacted in case of emergency