The primary purpose is to evaluate the level of physical activity in patients with knee osteoarthritis in a spa treatment and doing epidemiological study about this patient.

Explain the physical activity level of knee osteoarthritis by socio-demographic, clinical variables, barriers and facilitators of regular physical activity practice, fears and beliefs about their condition, functional limitations and physical inactivity.

Inclusion Criteria:

• Patients, male or female, aged 50 to 75 years.
• Patients with knee pain reported to osteoarthritis
• Patient affiliated to a social security scheme (beneficiary entitled)
• Patient registered spa

Exclusion Criteria:

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patients with knee pain reported to osteoarthritis