Physical exercise has a fundamental position in the chronic low back pain treatment. However, the physical activity level is often low in these patients and the adherence to the care program is not enough in the long term. The French Evaluation of the Perception of Physical Activity (EPPA) is a valid and reliable questionnaire, developed by N. Coste et al in 2020, that assesses the perceived barriers to and facilitators of physical activity in patients with knee osteoarthritis. To our knowledge, there is no valid and reliable instrument allowing such an assessment in chronic low back pain.

The main objective of this study is to adapt the EPPA to chronic low back pain and to evaluate its psychometric properties.

This validation would allow its use in current practice to adapt the care strategy, to personalize rehabilitation of each patient with chronic low back pain in order to have a better adherence to rehabilitation programs.

The EPPA was adapted to chronic low back pain and named EPPA-LOMB. It comprises 26 items.

Patients with chronic low back pain will be recruited during a medical consultation in the Physical Medicine and Rehabilitation Department of the University Hospital of Clermont-Ferrand and the Notre-Dame Functional Rehabilitation Center of Chamalières (France); or the first day of a functional spine rehabilitation program (3-week program in a day hospital) in the Physical Medicine and Rehabilitation Department of the University Hospital of Clermont-Ferrand.

Patients will be asked to complete a series of questionnaires after completing the non-opposition form. The management of non-specific chronic low back pain also requires evaluation through questionnaires, in accordance with the usual practices of the services participating in the study. No intervention will be taken.

All patients will complete questionnaires at inclusion.

Patients included during a medical consultation will receive an e-mail to complete online the EPPA-LOMB and visual analogic scales on pain and level of physical activity, 7 days after inclusion.

Patients included the first day of a functional spine rehabilitation program will complete questionnaires at the end of the program, 21 days after inclusion. They will be seen 3 months after their discharge during a follow-up medical consultation and will complete another time the questionnaires. Only patients not included in the study E-lombactifs (NCT04264949) will complete the questionnaire at 3 months.

Inclusion Criteria:

• Adults (18 years old and older)
• Patients with chronic low back pain evolving for at least 3 months, with a diagnosis confirmed by the French Health Authority and the classification from the French and European recommendations, that is lumbar pain, without red flags, with a possible pain radiculopathy
• Acceptance to participate in the study.
• Capable of providing informed consent to participate in this study.

Exclusion Criteria:

• Patients not diagnosed according to the French Health Authority and the classification from the French and European recommendations
• Refusal to participate
• Patients in the incapacity to answer the questionnaires
• Patients with a medical contraindication to physical activity
• Patients under guardianship, or protection of justice.

Patients with chronic low back pain seen in the Physical Medicine and Rehabilitation Department of the University Hospital of Clermont-Ferrand and in the Notre-Dame Functional Rehabilitation Center of Chamalières (France).