Visco Injections for Knee Arthritis: Types, Cost, and What to Expect 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 Nationally Recognized Pain Doctor What is the Best Injection for Knee Pain ? How Do Knee Gel Injections Work? The Science Explained Joint Relief Institute