Hyaluronic acid injections are designed to support joint lubrication and improve knee functionhelping to ease symptoms in some people with knee osteoarthritis. They work best as part of a bigger plan, Viscosupplementation injections for knee pain relief A gel injection for the knee helps improve joint lubrication when natural synovial fluid becomes thinner or less effective, which often happens with arthritis., This gel acts as a cushion and How GELSYN 3 works Bioventus OA Knee Pain Relief