There are several types of hyaluronic acid injections, also called viscosupplementation, that are used for knee osteoarthritis.

The theory behind these injections is that because people with OA have a lower than normal amount of HA in their joints, adding HA to the joint will improve symptoms by helping to cushion the joint. The injection seems to work by temporarily restoring the thickness of the joint fluid, allowing better joint lubrication and perhaps directly affecting pain receptors.

Sodium hyaluronate injection is directly injected into knee joint. It is very safe injection.