How to Quickly Lubricate a Stiff Knee Hyaluronic Acid Injection Joint Lube Dr. Green Life Understanding Joint Lubrication Injections: Viscosupplementation Burghealth Physical Medicine 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 Your knee isn't just a hingeit's a living, dynamic system built to move. Inside every healthy knee is synovial fluid, the natural lubricant that reduces friction, delivers nutrients to the cartilage,