What Is the Difference Between a Cortisone Shot and a Gel Shot?

A cortisone shot delivers a synthetic corticosteroid directly into a joint to suppress inflammation and relieve pain quickly, while a gel shot injects hyaluronic acid, a lubricating substance naturally found in joint fluid, to cushion and supplement the joint over a longer period. The two injections share the same basic delivery method and treat many of the same conditions, but they work through entirely different mechanisms and on different timelines. Which one makes more sense for you depends on the severity of your symptoms, how far your joint disease has progressed, and what you need in the short term versus the long run.

How Each Injection Works

Cortisone shots use a potent anti-inflammatory steroid, usually triamcinolone or methylprednisolone, injected straight into the joint space. The drug dampens the local immune response, reducing swelling, heat, and the chemical signals that trigger pain. Because the steroid is acting directly on inflamed tissue, pain relief can kick in within hours to a few days. About 60% of patients feel meaningfully better within three days of a corticosteroid injection, and over 90% experience relief within a week.¹ The steroid itself is metabolized relatively fast, so the injection’s benefit is often strongest in the first weeks and tends to fade after a few months.

A gel shot, formally called viscosupplementation, takes a different approach. Hyaluronic acid is a large, gel-like molecule your body already produces to keep synovial fluid slippery and shock-absorbing. In osteoarthritis, that fluid thins out and loses its cushioning properties. Injecting a concentrated hyaluronic acid preparation aims to restore some of that lost viscosity and lubrication.² Beyond the mechanical benefit, hyaluronic acid may also have modest anti-inflammatory and pain-signaling effects on the joint lining, though the exact biological pathways are still debated. Unlike cortisone, the onset of relief from a gel shot is slower and more gradual.

Speed of Relief and How Long It Lasts

This is where the two injections diverge most clearly. A cortisone shot is the sprinter: fast to start, fast to finish. Meta-analyses consistently show significant pain improvement in the first one to four weeks.³ More recent work suggests the effect can stretch to about three months in many patients, longer than older estimates of four to six weeks.⁴ Some evidence-based reviews describe pain relief and functional improvement lasting months and up to a year in certain patient populations.⁵ Still, the typical experience is a noticeable dropoff by the three-to-four-month mark.

Gel shots are the marathoner. Relief tends to build over several weeks, and most protocols involve a series of injections, often three to five given a week apart, before the full effect is felt. But once the benefit arrives, it may persist longer. One randomized trial comparing hyaluronic acid to a corticosteroid (methylprednisolone) found the two performed similarly at 12 weeks. After that, hyaluronic acid pulled ahead, with sustained improvements in pain, stiffness, and physical function scores through 26 weeks.⁶ A meta-analysis covering several such comparisons reached the same conclusion: corticosteroids provided better pain control in the first month, but hyaluronic acid overtook them by six months.⁷ Some benefit from gel shots may last up to 24 weeks or beyond.⁸

How They Compare Head to Head

Put bluntly, the research paints a picture of two treatments that shine in different windows. In the short term, corticosteroids are clearly superior at controlling pain. At three months, the gap largely closes. By six months, hyaluronic acid shows a measurable edge in both pain scores and functional measures.⁹ That crossover pattern has held up across multiple reviews, though the magnitude of hyaluronic acid’s later advantage is only moderate.

One complication in interpreting these results is the surprisingly large placebo effect that comes with any knee injection. Across hundreds of randomized trials, researchers have found that an average of roughly three-quarters of the overall pain improvement from knee osteoarthritis treatments can be attributed to the placebo response.¹⁰ Even sham saline injections produce clinically meaningful improvements in pain and function for months.¹¹ That doesn’t mean these injections are useless; rather, the act of getting a needle in the knee creates a strong therapeutic context, and both cortisone and gel shots add real benefit on top of that. But the placebo layer makes it harder to tease out how much each drug is truly doing on its own, and it’s part of why guideline bodies have had trouble agreeing on clear recommendations.

Side Effects and Safety Concerns

Neither injection carries dramatic risks for most people, but the side-effect profiles are quite different.

Cortisone shots can cause a temporary “flare” of pain in the injected joint, affecting roughly one in five patients. In one prospective study, about 21% of patients reported a pain flare, with younger patients more likely to experience it.¹ The more important concern is systemic absorption. Even a single joint injection can temporarily suppress the body’s own cortisol production and raise blood sugar. For people with diabetes, this can be significant: fasting blood glucose levels jumped meaningfully on the first day after a hand or wrist corticosteroid injection and remained elevated for about two days before returning to baseline.¹² A shoulder injection study in type 2 diabetes patients found a similar pattern, with mean glucose climbing from about 136 mg/dL before the injection to 159 mg/dL on day one, and about 20% of patients experiencing at least one reading above 350 mg/dL in the first three days.¹³ If you have diabetes, your doctor should discuss closer glucose monitoring for a few days after a cortisone shot. Beyond blood sugar, repeated corticosteroid injections have been linked to other systemic effects, including loss of bone density and, rarely, Cushing-like symptoms.¹⁴

Gel shots are generally well tolerated. The most common side effects are mild injection-site reactions: temporary pain, swelling, or warmth around the knee.¹⁵ There is no meaningful blood sugar spike or hormonal disruption. In rare cases, hyaluronic acid can trigger a more severe acute inflammatory reaction in the joint, sometimes called pseudoseptic arthritis because it mimics a joint infection. This is thought to be an immune hypersensitivity reaction to the injected material, and it typically happens after the second or third injection in a series.¹⁶ The incidence of these severe acute reactions is low but not negligible.¹⁷

What Repeated Injections Mean for Your Cartilage

This is the question most patients don’t think to ask, and the answer is concerning for cortisone. A systematic review of lab and animal studies found that corticosteroids show dose-dependent toxic effects on cartilage. At low doses, some beneficial effects on cartilage cell growth were observed, but at higher doses, there was significant cartilage damage and cell death.¹⁸ More directly relevant to patients, MRI-based imaging studies have found that repeated corticosteroid injections may be associated with greater cartilage thickness loss compared to saline injections.¹⁹ The practical takeaway is straightforward: cortisone shots are powerful tools for acute flares, but using them frequently year after year may accelerate the very joint damage you’re trying to manage. Most physicians try to limit injections to three or four per joint per year, though the evidence for a specific safe threshold is still thin.

Hyaluronic acid, by contrast, doesn’t appear to carry the same cartilage risk. Some observational data suggest it may even delay the eventual need for a total knee replacement. One large study found that patients receiving hyaluronic acid injections went significantly longer before needing surgery, gaining an extra 51 days at the one-year mark and over 200 additional days before knee replacement at seven and a half years compared to patients who did not receive the injections.²⁰ Comprehensive reviews have supported the notion that viscosupplementation can reduce pain, increase function, and delay surgery.²¹ This is observational evidence, not proof of a protective effect, but it at least suggests gel shots aren’t accelerating joint breakdown the way repeated steroid injections might.

Why Your Doctor’s Guidelines Might Not Match Your Neighbor’s

One of the more frustrating aspects of choosing between these injections is that professional organizations disagree about them. The American Academy of Orthopaedic Surgeons famously recommended against hyaluronic acid injections for knee osteoarthritis, citing insufficient evidence that they outperform placebo. Meanwhile, other organizations have recommended them, particularly for chronic knee osteoarthritis.⁸ The Italian orthopedic society, for example, recommends hyaluronic acid for chronic knee osteoarthritis.²² This disagreement across guidelines has had a measurable impact on practice patterns in the United States.²³

The practical consequence is that what you’re offered may depend less on the evidence and more on your doctor’s specialty, their training era, and which guidelines they follow. Orthopedic surgeons in the U.S. became less likely to offer gel shots after the AAOS recommendation, while rheumatologists and primary care physicians sometimes continued using them based on other guidelines. If you’re told gel shots aren’t an option and you want to explore them, it’s worth getting a second opinion from a provider in a different specialty.

Does It Matter How the Injection Is Delivered?

Both cortisone and gel shots can be given either “blind” (using anatomical landmarks to guide the needle) or with ultrasound guidance. This matters more than many patients realize. A systematic review of randomized controlled trials found that ultrasound-guided knee injections were more accurate than blind injections in every study examined, with the best technique achieving placement accuracy over 93%.²⁴ One trial found that roughly a third of clinician-estimated “accurate” injections were actually inaccurate, and that truly accurate injections led to greater functional improvement at six weeks.²⁵

The implication is the same for both injection types: if the medicine doesn’t end up in the joint space, it won’t work as well. This is worth asking about, particularly if you’ve had a shot that didn’t seem to help. The failure might have been mechanical, not pharmacological. Ultrasound-guided injections are increasingly available in orthopedic, rheumatology, and sports medicine offices, and they’re worth requesting if you have the option.

Cost and Insurance Differences

Cortisone shots are generally inexpensive and covered by virtually all insurance plans. The steroid drug itself costs very little, and the injection is a single visit lasting a few minutes. Gel shots are considerably more expensive. The hyaluronic acid preparations are specialty products, and a course of three to five weekly injections adds up. Insurance coverage for viscosupplementation has been inconsistent in the U.S., partly because of the AAOS guideline controversy noted above. Medicare has covered certain approved hyaluronic acid products, but private insurers vary. If you’re considering gel shots, verifying insurance coverage before scheduling is essential, because out-of-pocket costs for a full course can run into the thousands of dollars.

How Platelet-Rich Plasma Fits Into the Picture

You may have heard about PRP (platelet-rich plasma) injections as a third option. PRP uses a concentrated preparation drawn from your own blood, rich in growth factors that may stimulate tissue healing. In a head-to-head randomized trial comparing PRP to corticosteroids for moderate knee osteoarthritis, both groups experienced similar rapid pain relief in the first few weeks. However, PRP maintained its benefit far longer: at one year, the PRP group had a 52% reduction in pain scores from baseline compared to just 14% for the corticosteroid group.²⁶

A systematic review and meta-analysis comparing PRP to corticosteroids found that PRP was significantly better at reducing pain, stiffness, and functional limitations at three, six, and nine months, with the largest differences emerging at the six- and nine-month marks.²⁷ Three-way comparisons among PRP, hyaluronic acid, and corticosteroids suggest PRP is comparable to the other two at three months but pulls ahead in longer follow-up.²⁸ The major drawback is cost: PRP is rarely covered by insurance, and a single injection can cost several hundred dollars. There are also no universally standardized preparation protocols, so the actual product varies from clinic to clinic.

When Each Option Makes the Most Sense

If your knee is acutely swollen and painful, and you need functional relief within days for work, travel, or daily life, a cortisone shot is hard to beat. It’s fast, affordable, widely available, and very effective in the short term. The tradeoff is that its benefit fades, and repeated use carries real concerns about cartilage health and blood sugar spikes for diabetic patients.

If your osteoarthritis is mild to moderate and you’re looking for longer-lasting relief without the hormonal side effects, gel shots are a reasonable choice. They take longer to start working and cost more, but the benefit may persist further into the future and the joint-safety profile is more reassuring. They tend to be recommended more for chronic, stable knee osteoarthritis rather than acute inflammatory flares.

Neither injection cures osteoarthritis. Both are symptom-management tools, and both work best when combined with the fundamentals that actually slow joint disease: maintaining a healthy weight, staying physically active, and strengthening the muscles around the affected joint. If a provider is offering repeated injections without also discussing exercise and weight management, that’s a gap in your care plan worth addressing.

Use Beyond the Knee

Most of the research on both injections focuses on the knee because it’s the most common site for osteoarthritis injections. Cortisone, however, is routinely injected into shoulders, hips, elbows, wrists, and small joints of the hand and foot. Gel shots have been explored in other joints too, including the shoulder for osteoarthritis and adhesive capsulitis.²⁹ The evidence base outside the knee is thinner, and insurance coverage for hyaluronic acid in non-knee joints is more limited. If your shoulder or hip is the problem, cortisone remains the more established and accessible injectable option, though off-label gel shots are available at some clinics for patients willing to pay out of pocket.

One practical note about hyaluronic acid products: they aren’t all identical. Some are derived from rooster combs (avian-sourced), while others are produced by bacterial fermentation. If you have a known egg or poultry allergy, mention it before receiving a gel shot, as some avian-derived preparations could trigger a reaction. Fermentation-derived products avoid that concern entirely. The molecular weight and cross-linking of different hyaluronic acid formulations also vary, which may partly explain why clinical trial results bounce around. A one-injection, high-molecular-weight product and a five-injection, low-molecular-weight series are marketed under the same “gel shot” umbrella but aren’t delivering the same physical substance to the joint.