Hyaluronic Acid Injection Effective Knee Pain Remedies You Can Do at Home The Science Behind Knee Gel Injections: How Synovial Fluid Supplements Relieve Osteoarthritis Pain AMSK Clinic 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 A knee gel injection is used to improve lubrication inside the joint. In conditions like osteoarthritis, the natural synovial fluid that helps the knee glide smoothly can lose its protective Platelet Rich Plasma for Knee Osteoarthritis: When it works, when it does not work