CONSERVATIVE CARE · EVIDENCE-BASED · FRANKLIN, TN
Hyaluronic Acid Injections for Joint Pain
in Franklin, TN
Gel Injections for Knee Arthritis · An Option Before Joint Replacement · Dr. Cory Calendine, MD
Hyaluronic acid injections, also called viscosupplementation or gel injections, add a lubricating fluid to an arthritic joint to ease pain and improve movement. They are FDA-approved for knee osteoarthritis and are given as a single shot or a short series of injections in the office, with relief that usually builds over a few weeks and can last around six months in patients who respond. They do not regrow cartilage or reverse arthritis, so they are a way to manage symptoms and possibly delay surgery, not a cure. At the Bone and Joint Institute of Tennessee in Franklin, TN, Dr. Cory Calendine offers hyaluronic acid injections as one nonsurgical option for the right patient, and is direct about who they help and who they do not.
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UNDERSTANDING GEL INJECTIONS
What Hyaluronic Acid Injections Are and How They Work
Hyaluronic acid is a natural part of healthy synovial fluid, the slippery fluid that lubricates and cushions your joints. In an arthritic joint the amount and quality of that fluid drop, which is part of why the joint feels stiff, grinding, and painful. A hyaluronic acid injection places a gel-like form of that same substance directly into the joint to restore some of the lost lubrication and shock absorption. Because the gel is close to the body’s own joint fluid, it is usually well tolerated, and many patients feel smoother, less painful movement once it takes effect.
The important thing to understand is what the injection does and does not do. It supplements the fluid and can calm the mechanics that drive day-to-day pain. It does not rebuild cartilage or stop arthritis from advancing. For that reason it belongs in the conservative-care toolkit as a symptom treatment, most useful in earlier-stage arthritis and often used to buy comfortable time before considering joint replacement.
| Hyaluronic Acid Injections at a Glance | |
|---|---|
| What it is | A gel form of hyaluronic acid, a substance found in healthy joint fluid |
| Also called | Viscosupplementation, gel injections, gel shots |
| FDA-approved for | Knee osteoarthritis (hip and other joints are off-label) |
| How it is given | One injection, or a series of 3 to 5 weekly injections, in the office |
| When relief starts | Often 4 to 6 weeks; response varies from person to person |
| How long it lasts | Around 6 months in patients who respond |
| Best suited for | Mild to moderate knee arthritis |
| What it does not do | Regrow cartilage or reverse arthritis |
AN OVERVIEW OF THE RESEARCH
What the Evidence Says About Hyaluronic Acid Injections
The Honest Picture
The research on hyaluronic acid injections is genuinely mixed, and you deserve a straight answer rather than a sales pitch. Some large reviews find the benefit over a placebo injection is modest. Major bodies disagree with each other: the American Academy of Orthopaedic Surgeons does not recommend them, the American College of Rheumatology conditionally recommends against routine use, and several European and other guidelines take a more favorable position. That disagreement is real, and it is the reason candidacy matters so much.
Who Tends to Benefit
Underneath the debate is a consistent pattern. Patients with mild to moderate knee arthritis who still have some cartilage tend to respond better than patients with advanced, bone-on-bone disease. In responders, relief is often meaningful for daily activities and can last around six months, at which point the course can be repeated. Dr. Calendine’s approach is to identify the patients most likely to benefit, set realistic expectations, and skip the injection when the arthritis is too far along for it to help.
THE PROCEDURE, START TO FINISH
What to Expect from Gel Injections
The Injection Visit
The procedure is quick and done in the office. The area is cleaned and numbed, and the gel is injected into the joint, sometimes with ultrasound or imaging guidance to confirm placement. If extra fluid has built up in the joint, it may be drawn off first to reduce pressure. You can go home right afterward. Rest the joint for a day or two and avoid heavy activity such as running, prolonged standing, or heavy lifting, then return to normal use.
The Relief Timeline
Unlike a cortisone shot, hyaluronic acid works gradually. It can take four to six weeks to feel the full effect, so patients who do not notice an immediate change should give it time before concluding it did not work. Relief in responders often holds for about six months and can fade as arthritis advances. If the first course helps, it can be repeated.
| Stage | Timing | What Happens |
|---|---|---|
| Injection day | Day 0 | Office injection, sometimes image-guided; rest the joint 1 to 2 days |
| Early response | 1 to 6 weeks | Pain and stiffness ease gradually as lubrication takes effect |
| Peak relief | 6 to 12 weeks | Best gains in walking tolerance and daily activity |
| Duration | Up to about 6 months | Relief holds in responders; may fade as arthritis advances |
| Repeat course | After about 6 months | Can be repeated if the first course provided relief |
IS IT RIGHT FOR YOU
Who Is a Candidate for Hyaluronic Acid Injections
Good Candidates
Hyaluronic acid injections tend to fit patients who have mild to moderate knee osteoarthritis, remain active but are limited by pain, and have not had enough relief from first-line steps like activity change, physical therapy, weight management, and anti-inflammatory medication. They are also a reasonable option for patients who want to postpone knee replacement or who cannot take, or did not respond to, other injections.
When Another Path Makes MoreSense
Gel injections are generally less useful once arthritis reaches the advanced, bone-on-bone stage, where the cushion the gel supplements is largely gone. Patients with an active joint infection or certain allergies to injection ingredients are not candidates, and anyone with a known bird product allergy should mention it, since some older formulations are avian-derived while several newer ones are made without any bird-derived material. For the hip and other joints, use is off-label and Dr. Calendine discusses it individually. When the arthritis is too far along for injections to help, the more direct conversation is about joint replacement.
COMPARING INJECTION OPTIONS
Hyaluronic Acid vs Cortisone vs PRP Injections
Patients often ask how gel injections compare with the other joint injections. Each does something different, and the right choice depends on the goal. Cortisone works fastest but wears off sooner, and repeated shots can be hard on cartilage over time. Hyaluronic acid works more slowly but tends to last longer and is gentler on the joint. PRP is a separate biologic option covered in detail on the PRP Injections page. Dr. Calendine will walk through which one fits your joint and your goals.
| Comparison | Hyaluronic Acid | Cortisone | PRP |
|---|---|---|---|
| How it works | Restores joint lubrication | Reduces inflammation | Uses your own concentrated platelets |
| Onset | Slower, over weeks | Fast, within days | Slower, over weeks |
| Typical duration | Around 6 months | Weeks to a few months | Variable, evidence still developing |
| Cartilage effect | Considered cartilage-friendly | Repeated use may affect cartilage | Under study |
| Best use | Ongoing mild to moderate knee arthritis | Short-term relief of a painful flare | Earlier-stage arthritis, selected patients |
WHAT TO KNOW BEFORE YOU DECIDE
Cost, Insurance, and Brands
Coverage and Cost
Medicare and most private insurers cover a limited number of hyaluronic acid injections for the knee, but approval can be slow and requirements vary by plan. Out-of-pocket costs, when a patient pays directly, commonly start around a few hundred dollars per injection. Our team will check your specific coverage before treatment so there are no surprises, and will talk through the numbers honestly if you are weighing this against other options.
Brands and Formulations
Several FDA-approved brands are available, including single-injection and multi-injection products. They all contain the same active ingredient, hyaluronic acid, and no single brand has been shown to clearly outperform the others. The practical differences come down to the number of visits, the source of the material (some older products are avian-derived, several newer ones are not), and what a patient's insurance covers. Dr. Calendine selects the formulation based on your arthritis, allergy history, and coverage.
WHEN INJECTIONS ARE NO LONGER ENOUGH
When Injections and Conservative Care Have Run Their Course
Hyaluronic acid injections are one step in a conservative-care plan, not a finish line. For many patients they provide comfortable months and a way to delay surgery. But when the injections stop helping, or when arthritis has advanced past the point where they can help, that is useful information, not a failure. It tells you and your surgeon that it may be time for a more definitive conversation.
If you reach that point, Dr. Calendine offers a full range of hip and knee options, including total knee replacement, partial knee replacement, total hip replacement, and robotic-assisted joint replacement. You can also review the full range of nonsurgical options on the Nonsurgical Joint Pain Treatment page.
FREQUENTLY ASKED QUESTIONS
Gel Injections for Joint Pain
What are hyaluronic acid injections and how do they work for joint pain?
Hyaluronic acid injections, also called viscosupplementation or gel injections, place a gel form of hyaluronic acid into an arthritic joint. Hyaluronic acid is a natural part of healthy joint fluid that acts as a lubricant and shock absorber, and arthritis reduces how much of it your joint has. The injection supplements that fluid so the joint moves more smoothly and hurts less. It works mainly by improving lubrication and cushioning, not by rebuilding cartilage, so it manages symptoms rather than curing arthritis.
Do hyaluronic acid injections actually work?
The evidence is genuinely mixed, and the honest answer is that they work for some patients and not others. Large reviews show the average benefit over placebo is modest, and medical bodies disagree on their use. In practice, patients with mild to moderate knee arthritis who still have some cartilage are the most likely to get meaningful relief, often lasting around six months. Patients with advanced, bone-on-bone arthritis are much less likely to benefit. Dr. Calendine’s approach is to recommend the injection only when a patient is a good candidate. management and exercise. Candidacy is discussed honestly at consultation.
How long do hyaluronic acid injections last?
Relief usually builds gradually over four to six weeks rather than right away, and in patients who respond it commonly lasts about six months. Because it takes time to work, patients who do not feel a change immediately should wait before concluding it did not help. If the first course provides relief, it can be repeated after about six months.
Are hyaluronic acid injections FDA-approved for the hip?
No. Hyaluronic acid injections are FDA-approved specifically for osteoarthritis of the knee. Some physicians use them off-label in the hip and other joints, but the supporting evidence there is weaker. Dr. Calendine discusses off-label use individually and will tell you honestly whether it is a reasonable option for your joint.
What are the side effects and risks?
Most side effects are mild and short-lived, such as temporary pain, warmth, or swelling at the injection site that eases with rest and ice over a day or two. A small number of patients have a stronger reaction with more swelling that a provider can treat. As with any injection into a joint, there is a rare risk of infection. Tell your provider about any allergies, including bird product allergies, since some formulations are avian-derived.
Does insurance cover hyaluronic acid injections, and what do they cost?
Medicare and most private insurers cover a limited number of knee hyaluronic acid injections, though approval can be slow and rules vary by plan. When paid out of pocket, costs commonly start at a few hundred dollars per injection. Our team checks your coverage before treatment. To find out whether gel injections fit your knee, schedule a consultation with Dr. Cory Calendine at the Bone and Joint Institute of Tennessee, 3000 Edward Curd Lane, Franklin, TN 37067, or call (615) 791-2630.
FRANKLIN, TN · SERVING ALL OF MIDDLE TENNESSEE
Find Out Whether Gel Injections Fit Your Knee
Start with a Consultation.
Hyaluronic acid injections help some patients and not others. The way to know is a straightforward evaluation. Dr. Calendine will look at your joint, your imaging, and your goals, and tell you honestly whether gel injections, another nonsurgical option, or surgery makes the most sense. Bone and Joint Institute of Tennessee, 3000 Edward Curd Lane, Franklin, TN 37067.