A gel injection into the knee, also known as hyaluronic acid injection, is a treatment for knee pain caused by osteoarthritis. The procedure involves injecting a gel-like fluid called hyaluronic acid into the knee joint. Hyaluronic acid is a natural substance found in the synovial fluid that surrounds joints, and acts as a lubricant and shock absorber for joint loads | Precision Care Medical & Sports Performance

9 non-prescription ways to manage pain