Homemade Personal Lube: Safer, Sustainable Options for Sensitive Skin Gel injections for the knee are used to improve joint lubrication and reduce pain caused by arthritis and joint degeneration., Over time, the natural fluid inside the knee loses its ability to Gel injections help reduce friction inside the knee joint, especially with arthritis or wear and tear., They add cushion and lubrication to make movement smoother and pain more manageable., Knee Joint Wear and Tear, Knee Joint Pain, Restoring Joint Lubrication Function Injectable Hyaluronic Acid, Knee Pain Relief Made in China.com Gel injections for the knee involve the injection of a gel like substance into the knee joint to provide lubrication and cushioning. This treatment is often used to alleviate pain and improve mobility