How to Quickly Lubricate a Stiff Knee 7 Ways to Lubricate Joints Naturally for Less Pain Knee Joint Cartilage And Synovial Fluid Illustration 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 Altered joint tribology in osteoarthritis: Reduced lubricin synthesis due to the inflammatory process. New horizons for therapeutic approaches ScienceDirect