Hyaluronic Acid Injections — A Complete Patient Guide

What Is Hyaluronic Acid and Why Does It Matter?

Hyaluronic acid is a substance naturally produced by the body, present in high concentrations in synovial fluid — the fluid that fills our joints. Its role is essential: it lubricates the joint surfaces and absorbs mechanical forces with every step.

A simple analogy: healthy synovial fluid is like quality motor oil — viscous, elastic, protective. With osteoarthritis, this fluid loses its properties: it becomes thinner, less protective, and the cartilage — deprived of adequate lubrication — wears out faster.

An injection with hyaluronic acid (viscosupplementation) partially restores the quality of the synovial fluid, giving the joint what it's missing.

How Does the Treatment Work?

The procedure is simple: a synthetic hyaluronic acid preparation is injected directly into the joint space using a fine needle. It works on several levels:

• Lubricates the joint surfaces, reducing friction between bones
• Absorbs impact forces during walking, climbing stairs, and lifting
• Reduces inflammation in the synovial membrane
• Protects the remaining cartilage from further wear

The procedure is done in the office, takes a few minutes, and does not require general anesthesia. A local anesthetic can be applied for extra comfort. If there is excess synovial fluid ("water on the knee"), it will be aspirated before the injection — which brings immediate relief from the feeling of pressure.

Who Is It Indicated For?

Hyaluronic acid injections provide the best results for patients with:

• Stage II-III (Kellgren-Lawrence) knee osteoarthritis — the stages where cartilage is worn but not completely destroyed
• Pain that does not respond sufficiently to anti-inflammatory drugs and physical therapy
• A desire to postpone knee replacement surgery — injections can buy months or years of comfort

Viscosupplementation is most commonly used for the knee, but it can also be effective for other joints — such as the hip, shoulder, and ankle — depending on the clinical evaluation.

When are they NOT indicated:

• Stage IV osteoarthritis, with complete cartilage destruction ("bone-on-bone") — at this stage, injections may offer minimal or temporary relief. The definitive solution is knee replacement.
• Active infection in the joint or the skin at the puncture site
• Known allergy to hyaluronic acid preparations

What Results to Expect?

It is important to have realistic expectations:

Relief is not instantaneous. The effect typically begins 10-14 days after the injection. Don't be discouraged if you don't feel immediate improvement.

Duration of effect: between 6 and 12 months, depending on the stage of osteoarthritis, physical activity, and individual response. If the treatment is effective, it can be repeated at intervals of at least 6 months.

What it improves: pain with walking, stiffness, and discomfort during daily activities.

What it does NOT do: it does not repair damaged cartilage, completely halt the progression of osteoarthritis, or replace physical therapy and weight management. The injection is one piece of a broader therapeutic plan.

Hyaluronic Acid vs. PRP vs. Cortisone — In Brief

This is a common question. In short:

• Hyaluronic acid — lubricates the joint. Effect in 10-14 days, lasts 6-12 months. The most studied for the knee.
• PRP — stimulates tissue regeneration with growth factors from your own blood. Effect in 2-4 weeks. Also effective for tendinopathies.
• Cortisone — rapidly reduces inflammation (24-72 hours), but the effect is temporary (4-8 weeks). Repeated doses are not recommended — it can accelerate cartilage degradation.

The choice is made during the consultation, based on each patient's situation. Often, combining them offers the best results. → Read the full comparison between HA, PRP, and cortisone

Detailed Information — Patient Brochure

I have created a brochure that explains in detail everything you need to know about hyaluronic acid injections: the mechanism of action, the step-by-step procedure, recommendations before and after the injection, risks, contraindications, and compatibility with other treatments.

📄 Download the brochure: Hyaluronic Acid Injections — Joint Viscosupplementation (PDF)

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