Inclusion Criteria:  Be over 18 years of age at the time the agreement is made. Have had low back pain for more than 3 months. Have back pain greater than or equal to 2 on the Visual Analog Scale. Free patient, without guardianship or tutelage, nor subordination No objection from the patient after clear and fair information about the study  Exclusion Criteria:  Have a life expectancy of less than 12 months (assessed by the physician) at the time of inclusion. Persons benefiting from reinforced protection, i.e. minors, persons deprived of their liberty by a judicial or administrative decision, persons staying in a health or social institution, adults under legal protection, pregnant or breast-feeding women and finally patients in emergency situations