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 Altered joint tribology in osteoarthritis: Reduced lubricin synthesis due to the inflammatory process. New horizons for therapeutic approaches ScienceDirect Joint Fluid Supplementation: Restoring Knee Lubrication Naturally Campbell Health Center Knee Gel Injections (Viscosupplementation): Uses & Side Effects How to Boost Synovial Fluid and Support Healthy Joints