Knee Pain Treatment Without Surgery: PRP, Injections & RFA Capitol Pain Knee Gel Injections (Viscosupplementation): Uses & Side Effects 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 Fluid Lubricates Joints Biological Strategy AskNature Knee Joint Cartilage And Synovial Fluid Illustration