Hyaluronic acid (HA) injections, are one treatment option for knee osteoarthritis (OA).

They aim to improve the lubricating and shock-absorbing properties of the synovial fluid in the knee.

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How they work

In osteoarthritis, the concentration and quality of natural hyaluronic acid in the joint decreases. Injecting Hyaluronic Acid:

• Improves joint lubrication.

• Reduces friction between cartilage surfaces.

• Decreases pain.

• Improves mobility and function.

• Potentially have mild anti-inflammatory effects.

 

Who may benefit?

Hyaluronic Acid injections will be most helpful for patients with:

• Mild to moderate knee OA (Kellgren-Lawrence grades II–III).

• Persistent pain despite exercise, weight loss, acetaminophen, or NSAIDs.

• Those who wish to delay knee replacement surgery.

• Patients who cannot tolerate NSAIDs.

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Effectiveness

Research shows mixed results:

• Some patients experience meaningful pain relief lasting 3–6 months.

• Benefits usually begin 2–6 weeks after injection.

• Approximately 40–60% of patients report improvement.

• The average benefit is modest, but some individuals experience substantial relief.