Knee Gel Injections (Viscosupplementation): Uses & Side Effects How Do Knee Gel Injections Work? The Science Explained Joint Relief Institute Knee Osteoarthritis: Early Signs, Causes, Diagnosis, Treatment 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 lubricant Lubricating Injections Can Soothe Knee Osteoarthritis