What gel injections are
Healthy knees are cushioned by synovial fluid, which is thick and slippery because it contains hyaluronic acid. In osteoarthritis the fluid thins and the cartilage wears, so the joint surfaces grind and the knee becomes stiff, swollen and painful. Viscosupplementation, which patients almost always call gel injections, places a hyaluronic acid gel directly into the knee joint to restore some of that cushioning and reduce pain. It treats symptoms; it does not rebuild cartilage.
Several products are in use. Some are given as a single injection, others as a series of three to five injections one week apart. The doctor chooses based on your knee, your plan's formulary and your schedule. Any of the products can be used at either clinic.
Gel injections are usually offered after a course of conservative care, and they are one option among several for knee pain and arthritis.
Who is a candidate
To qualify, and for insurance to consider covering it, two things need to be documented:
- A weight-bearing knee X-ray showing osteoarthritis. A standing X-ray is required because it shows how much joint space is lost under load. If you do not have one, we order it.
- At least three months of conservative care that has not given enough relief: anti-inflammatory or other medication, exercise or physical therapy, weight management where relevant, and usually a steroid injection into the knee.
Gel injections work best in mild to moderate arthritis. In advanced bone-on-bone arthritis the benefit is smaller and the doctor will say so; a surgical opinion may be the more honest recommendation. An infected knee, a skin infection over the joint, or an allergy to a product's ingredients rules the injection out until resolved.
Does insurance cover it? Medicare covers knee gel injections when the X-ray and conservative care are documented, and we build that documentation before ordering the product. Many Medicare Advantage and commercial plans require prior authorization, some restrict which product they cover, and a few do not cover viscosupplementation at all. Because the gel is ordered specifically for you, our front desk verifies your plan's rules and any authorization before the product is ordered, and tells you in advance if any part would be your responsibility. Self-pay is available. Read more about insurance and self-pay.
What to expect
- Before you come in, we verify your insurance and ask for photo ID, your medication list, and any knee X-ray or MRI reports and records of prior treatment.
- At the consultation, the doctor examines the knee, reviews or orders the standing X-ray and confirms whether you meet the criteria.
- Authorization and ordering. The front desk verifies coverage and obtains any authorization, then the product is ordered. This usually takes one to two weeks.
- The injection takes a few minutes. The skin is numbed, any excess fluid may be drawn off the knee, and the gel is injected, with ultrasound guidance when it helps. You walk out of the office.
- Follow-up. For a series, you return weekly until it is complete. The doctor reviews the result at about six to eight weeks.
| What it treats | Knee osteoarthritis, mild to moderate, after three months of conservative care |
|---|---|
| Visit length | About 15 to 20 minutes per injection visit |
| Typical course | One injection, or three to five weekly injections; repeat no sooner than six months if it helped |
| Downtime | Take it easy for 48 hours, then normal activity |
| Coverage | Medicare with documentation; other plans verified individually; some do not cover |
How long relief lasts and aftercare
Gel injections are not instant. Many patients notice improvement over two to six weeks, and relief often lasts several months, sometimes longer. Results vary, and some knees do not respond. If the first series helped, it can be repeated, but no sooner than six months after the previous one.
For 48 hours after each injection, avoid strenuous activity, long walks, jogging and heavy lifting. Mild swelling, warmth or aching in the knee for a day or two is common and settles with ice and rest. Anything worse than that, or a knee that becomes hot, red and very painful, should be reported to the clinic the same day.
Does a gel injection hurt?
The skin is numbed first, so most patients feel pressure rather than pain, and it is over in a few minutes. The knee may ache for a day or two afterward.
How is this different from a cortisone injection?
Cortisone calms inflammation within days and is limited to three or four injections a year in the same joint. Gel takes a few weeks to work, often lasts longer, and can be repeated every six months. In-network plans, and Medicare, expect a steroid injection to have been tried before gel is approved.
Can I have gel injections in both knees?
Yes. Each knee needs its own X-ray and documentation, and the doctor may stagger the two so you always have one knee to lean on during the 48-hour rest period.
Which clinic offers knee gel injections?
Both. Davie serves Broward County and Boynton Beach serves Palm Beach County, and the same products and criteria apply at each.
Will my insurance cover it?
Medicare does with documentation. Other plans vary, and some exclude it. When you book, the front desk checks your specific plan and tells you where you stand before any product is ordered.
What if gel injections do not help?
The doctor documents the response and discusses the next step, which may be a genicular nerve block, PRP as a self-pay option, StemWave at Davie for the soft tissue around the knee, or a referral for a surgical opinion.