How to relieve knee pain from arthritis? Gel injections (hyaluronic acid) are used to lubricate the knee joint, especially in cases of arthritis. They improve joint movement by reducing friction and Can you inject peptides into the knee? Injectable BPC 157: Better for Knee Recovery in Knoxville 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