Ostenil consists of hyaluronic acid.  Ostenil is used to treat osteoarthritis.
The mechanism of action:
Hyaluronic acid in body is a natural component of synovial liquid, which function is to lubricate for joints and ligaments. It’s generally known that synovial liquid in joints affected with osteoarthritis, has lower elasticity and viscosity, than synovial liquid in healthy joints.
The hyaluronic acid injection into joint for the purpose of viscosity renewal may decrease pain and to restore the mobility in joint.