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Osteoarthritis is the most common joint disease, and this frequency increases with age. There are many risk factors: age, carrying heavy loads, professional activities such as tilers, high-level athletes, inflammatory diseases, trauma, morphological abnormalities of the knees for example, or genetic causes. The lesions affect the cartilage, the bone underneath, and the synovial membrane. The cartilage will wear out, which leads to inflammation and pain. The diagnosis is based on pain and stiffness, and functional impotence. It evolves in flare-ups. The X-ray shows joint pinching. Treatments are first to change your lifestyle, lose weight and exercise, eat healthily, do not carry heavy loads. Then use painkillers if necessary, of increasing effectiveness if necessary, because you must not let the pain settle in. Then come anti-inflammatories, or even corticosteroids; Then infiltrations, corticosteroids and/or hyaluronic acid. As a last resort, total prostheses can be proposed, especially for large joints. Other therapies sometimes proposed (essential oils, osteo, cures, food supplements, etc.) are not discussed here. 00:00 introduction 00:46 risk factors 02:59 lesions: cartilage, bone and synovium 04:15 diagnosis 05:43 treatments #savoirvivreetsanté #osteoarthritis #cartilage