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What Are Hyaluronic Acid Knee Injections?
- Hyaluronic acid injections are a type of viscosupplementation therapy.
- They are designed to improve lubrication within the knee joint.
- Hyaluronic acid is a naturally occurring substance found in joint fluid.
- In osteoarthritis, natural hyaluronic acid levels decrease.
- The injection helps restore cushioning and smooth joint movement.
How Hyaluronic Acid Works
- Acts as a lubricant and shock absorber within the joint.
- Improves joint fluid viscosity.
- Reduces friction between cartilage surfaces.
- May help protect remaining cartilage.
- Provides gradual pain relief over several weeks.
- Effects can last several months.
Conditions Treated with Hyaluronic Acid Injections
- Mild to moderate knee osteoarthritis
- Chronic degenerative joint pain
- Cartilage thinning
- Patients not ready for knee replacement
- Patients who have not responded to physical therapy or medications
What to Expect During the Procedure
- Performed in an outpatient office setting.
- The knee is sterilized prior to injection.
- Fluid may be removed from the knee if swelling is present.
- A prefilled syringe of hyaluronic acid is injected into the joint.
- Ultrasound guidance may be used for accuracy.
- The procedure takes only a few minutes.
- Some treatment plans require a series of injections (usually 1–3).
After the Injection
- Mild swelling or stiffness may occur temporarily.
- Ice can be applied for comfort.
- High-impact activities should be avoided for 24–48 hours.
- Pain relief typically begins within 2–4 weeks.
- Maximum benefit may take several weeks.
Benefits of Hyaluronic Acid Injections
- Improves joint lubrication
- Reduces pain gradually
- May improve mobility and walking comfort
- Can delay need for knee replacement
- Minimal downtime
- Lower systemic side effects compared to oral medications
Risks and Potential Side Effects
- Temporary injection site pain
- Mild swelling
- Warmth or redness
- Infection (rare)
- Allergic reaction (rare)
- Limited effectiveness in advanced “bone-on-bone” arthritis
How Long Do Results Last?
- Relief may last 4–6 months or longer in some patients.
- Repeat treatments may be recommended depending on response.
- Some patients experience improved function for extended periods.
Who Is a Good Candidate?
- Patients with mild to moderate osteoarthritis
- Individuals seeking non-surgical options
- Patients who did not achieve sufficient relief from corticosteroid injections
- Patients looking for longer-lasting relief compared to steroid injections
Who May Not Benefit?
- Patients with advanced bone-on-bone arthritis
- Patients with severe joint deformity
- Patients with active joint infection
- Patients allergic to hyaluronic acid components
