There is no single “best” injection for arthritis. The right choice depends on the type of arthritis you have, how advanced it is, and what you’ve already tried. Corticosteroid injections remain the most widely used option for fast relief, while hyaluronic acid gel injections and platelet-rich plasma (PRP) offer longer-lasting alternatives for osteoarthritis specifically. Each works differently, lasts a different amount of time, and comes with its own tradeoffs.
Corticosteroid Injections: The First-Line Option
Corticosteroid shots (often called cortisone shots) are typically the first injection a doctor will recommend. They contain a powerful anti-inflammatory medication paired with a numbing agent that provides immediate short-term relief. The steroid component takes up to a week to fully kick in, and the overall benefit usually lasts somewhere between a few weeks and a few months.
These injections work for nearly every type of arthritis, including osteoarthritis, rheumatoid arthritis, gout, and psoriatic arthritis. They’re effective at calming an active flare, reducing swelling, and restoring mobility in a joint that’s become stiff and painful. A short-term increase in pain and swelling for up to two days after the injection is common. This “steroid flare” typically resolves on its own.
The main limitation is that corticosteroid injections can’t be repeated indefinitely. Most doctors limit them to three or four per year in the same joint because repeated use can weaken cartilage and surrounding tissue over time. They also don’t change the underlying disease. Once the medication wears off, the arthritis is still there. That said, for people dealing with a painful flare or needing a bridge to other treatments, cortisone shots are fast, affordable, and widely available. Under Medicare, a therapeutic injection at an outpatient surgical center costs roughly $101 total, with the patient’s share averaging around $19.
Hyaluronic Acid Gel Injections
Hyaluronic acid injections, also called viscosupplementation or “gel shots,” are designed specifically for knee osteoarthritis. The injected gel mimics a substance your joints naturally produce to lubricate and cushion cartilage. As osteoarthritis progresses, that natural fluid thins out, and replacing it can reduce friction and pain.
A study from the Hospital for Special Surgery analyzing randomized controlled trials found that these injections produced successful outcomes in 60% of knee osteoarthritis patients. Depending on the brand, you’ll receive either a single injection or a series of three to five weekly shots. Common brands include Synvisc-One (one shot), Synvisc (three shots), and Hyalgan (up to five weekly shots). The relief typically lasts about six months, after which the treatment can be repeated.
Gel injections tend to work best for mild-to-moderate osteoarthritis. If you have bone-on-bone damage, the benefit is often minimal because there isn’t enough intact cartilage for the lubrication to help. Insurance coverage varies. Medicare and many private insurers cover viscosupplementation for the knee, but PRP (discussed below) usually isn’t covered, which makes gel shots a practical middle ground between cortisone and more expensive options.
Platelet-Rich Plasma (PRP)
PRP injections use a concentrated portion of your own blood. A small sample is drawn, spun in a centrifuge to separate the platelets, and the resulting platelet-rich solution is injected into the joint. Platelets contain growth factors that may help reduce inflammation and promote tissue repair.
Head-to-head research comparing PRP to hyaluronic acid for knee osteoarthritis has shown promising results. One systematic review found that PRP produced roughly a 50% decrease in symptoms at the four-week mark, compared to about 25% for hyaluronic acid. Studies also suggest that two PRP injections spaced apart perform better than a single injection.
The downsides are cost and access. PRP typically runs $500 to $2,000 per injection and is rarely covered by insurance. The evidence, while encouraging, is still building. Results can also vary because there’s no universal standard for how the blood is processed, meaning the concentration of platelets differs from clinic to clinic. For people with mild-to-moderate osteoarthritis who haven’t responded well to cortisone or gel shots, PRP is worth discussing with an orthopedic specialist.
Biologic Injections for Inflammatory Arthritis
If you have rheumatoid arthritis, psoriatic arthritis, or ankylosing spondylitis, the conversation shifts to biologic medications. These are self-injected or infusion-based drugs that target specific parts of the immune system driving joint inflammation. Unlike cortisone, which treats symptoms in one joint at a time, biologics work throughout the body to slow or stop the disease from damaging your joints.
Biologics take longer to work. You can expect at least a few weeks before noticing improvement, with the full effect often taking three to four months. Some people need six months or more. If your biologic is a weekly self-injection, improvement tends to come sooner than with less frequent dosing schedules. The results, however, can be transformative for people with autoimmune forms of arthritis, often reducing pain, swelling, and fatigue far beyond what any joint injection alone could achieve.
Stem Cell Injections: What to Know
Stem cell injections are heavily marketed for arthritis, but the reality is far more cautious than the advertising. The FDA has not approved any stem cell product for the treatment of osteoarthritis, tendonitis, back pain, hip pain, knee pain, or any other orthopedic condition. The only FDA-approved stem cell therapies involve blood-forming cells from umbilical cord blood, and those are used exclusively for blood disorders.
The FDA has specifically warned that patients seeking cures may be misled by information about products that are illegally marketed, have not been shown to be safe or effective, and in some cases carry significant safety risks. Clinics offering stem cell injections for arthritis are operating outside of established regulatory approval, and the treatments typically cost thousands of dollars out of pocket with no insurance coverage. Until rigorous clinical trials demonstrate clear benefits, this option carries more risk and uncertainty than established alternatives.
Why Injection Accuracy Matters
How the injection is delivered can matter as much as what’s being injected. A systematic review of randomized controlled trials found that ultrasound-guided knee injections were more accurate than blind injections (where the doctor uses landmarks on the body to estimate needle placement) across every needle entry point studied. Blind injections had inconsistent accuracy rates that varied widely depending on the approach used.
When the needle misses the joint space, the medication ends up in surrounding tissue where it can’t do its job. If you’re getting an injection that requires precision, particularly hyaluronic acid or PRP, asking whether the provider uses ultrasound guidance is a reasonable question. Not every cortisone shot requires it, especially in large, easy-to-access joints like the knee, but for smaller or deeper joints like the hip, imaging guidance significantly improves results.
Choosing the Right Injection for Your Situation
The “best” injection depends on several overlapping factors:
- For a painful flare you need to calm quickly: corticosteroid injections provide the fastest relief, often within a week.
- For mild-to-moderate knee osteoarthritis with ongoing pain: hyaluronic acid injections offer about six months of relief and can be repeated.
- For osteoarthritis that hasn’t responded to cortisone or gel shots: PRP may provide greater symptom reduction, though at a higher out-of-pocket cost.
- For rheumatoid or psoriatic arthritis: biologic injections target the root cause of joint damage rather than masking symptoms in a single joint.
Many people cycle through more than one of these options over the course of their arthritis. Starting with corticosteroid injections for immediate relief while exploring longer-lasting alternatives is a common and practical approach. The severity of your joint damage, your insurance coverage, and how your body responds to an initial injection all play into the decision.