In a normal, healthy joint, a fluid called hyaluronan provides lubrication. However, if you have osteoarthritis, there is less supply of this fluid. Hyaluronic acid joint injections supplement the joint’s hyaluronan with hyaluronic acid.
If the treatment is effective, you may see results within days (although it may take more than one injection to make the pain go away) and the relief often lasts for several months. In some cases, your doctor may recommend repeat courses.