Ostenil is a hyaluronic acid injection used to help relieve pain and improve movement in joints affected by osteoarthritis, particularly the knee. Hyaluronic acid occurs naturally in healthy joints, where it helps to cushion and lubricate movement. Ostenil works by supplementing this natural lubrication, which may help to reduce stiffness and discomfort and make everyday activities easier. Treatment is carried out following a full assessment to determine whether it is a suitable option for your individual needs.