It seems like you might be referring to "GFC" as a treatment or therapy for knee osteoarthritis. However, as of my last update in January 2022, there is no widely recognized treatment or therapy known as "GFC" for knee osteoarthritis. It's possible that you may be referring to a specific treatment or therapy that has been developed or researched since then, or it could be a typo or a misunderstanding. Common treatments for knee osteoarthritis include: Lifestyle Modifications: This includes weight management, regular exercise (such as low-impact activities like swimming or cycling), and using assistive devices (such as braces or canes) to reduce stress on the knees. Medications: Over-the-counter pain relievers like acetaminophen or nonsteroidal anti-inflammatory drugs (NSAIDs) can help reduce pain and inflammation. In some cases, corticosteroid injections may be recommended to provide temporary pain relief. Physical Therapy: A physical therapist can design a tailored exercise program to improve strength, flexibility, and range of motion in the knee joint. Injections: Besides corticosteroid injections, other types of injections, such as hyaluronic acid injections, platelet-rich plasma (PRP) injections, or stem cell injections, may be considered to reduce pain and improve joint function. Surgery: For severe cases of knee osteoarthritis that do not respond to conservative treatments, surgical options such as arthroscopic debridement, osteotomy, or total knee replacement may be recommended. If "GFC" refers to a specific treatment or therapy developed after my last update, I would recommend consulting with a healthcare professional or conducting further research to understand its efficacy, mechanism of action, and potential benefits for knee osteoarthritis.