Knee Gel Injections (Viscosupplementation): Uses & Side Effects Viscosupplementation injections for knee pain relief How to Boost Synovial Fluid and Support Healthy Joints Fluid Lubricates Joints Biological Strategy AskNature 7 Ways to Lubricate Joints Naturally for Less Pain 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