Key Takeaways
- PRP (platelet-rich plasma) and hyaluronic acid (HA) are newer injection options for CMC arthritis, with growing but still limited evidence.
- Hyaluronic acid may provide similar pain relief to cortisone (about 30-50% reduction) with potentially longer-lasting effects and fewer side effects.
- PRP shows promising early results, with some studies reporting up to 12 months of benefit, but high-quality evidence is still limited.
- Neither treatment is typically covered by insurance, and costs range from $200-800 per injection depending on location and provider.
If cortisone injections are not working well for your thumb arthritis, or you are looking for alternatives with potentially fewer side effects, you have probably heard about PRP and hyaluronic acid injections. These newer treatments are increasingly offered by hand specialists, but the marketing hype can make it hard to separate hope from evidence. Here is an honest look at what we know and do not know.
What Is Hyaluronic Acid (HA)?
Hyaluronic acid is a naturally occurring substance found in healthy joint fluid. It acts as both a lubricant and a shock absorber. In arthritis, the quality and quantity of natural hyaluronic acid decreases. Injecting synthetic or purified HA into the joint aims to restore some of this natural cushioning — a process sometimes called “viscosupplementation.”
What the Evidence Shows for HA
- Multiple randomized trials have studied HA injections for CMC arthritis, with generally positive results
- A 2020 meta-analysis of 5 trials found that HA injections provide comparable pain relief to cortisone at 3 months, with some studies showing better results at 6 months
- HA may be particularly useful in Eaton stages I-II (earlier disease) where cartilage is still present
- Side effects are generally milder than cortisone — less risk of cartilage damage with repeated injections
- Some patients report the injection itself is slightly more painful than cortisone because of the thicker fluid
- The most commonly studied HA products for thumb arthritis include Synvisc, Durolane, and Ostenil
What Is PRP (Platelet-Rich Plasma)?
PRP is made from your own blood. A small sample is drawn, placed in a centrifuge to concentrate the platelets and growth factors, and then injected into the arthritic joint. The theory is that these concentrated growth factors may stimulate tissue repair, reduce inflammation, and possibly slow the progression of arthritis.
What the Evidence Shows for PRP
- The evidence for PRP in CMC arthritis is promising but still in early stages — most studies are small and some lack proper control groups
- A 2021 randomized trial comparing PRP to cortisone found that PRP provided similar pain relief at 3 months but better results at 6 and 12 months
- PRP may have disease-modifying potential — some studies suggest it could slow cartilage loss, though this needs confirmation in larger trials
- Because PRP uses your own blood, allergic reactions are essentially nonexistent
- The main downside is inconsistency: the quality of PRP varies depending on the preparation method, and there is no standardized protocol yet
- Some patients experience a 1-2 week flare after PRP injection before improvement begins — this is longer than the 1-2 day cortisone flare
How Do They Compare to Cortisone?
| Factor | Cortisone | Hyaluronic Acid | PRP |
|---|---|---|---|
| How it works | Reduces inflammation | Lubricates and cushions joint | Growth factors stimulate repair |
| Onset of relief | 3-7 days | 2-4 weeks | 2-6 weeks |
| Duration | 3-6 months | 4-8 months | 6-12 months (limited data) |
| Evidence level | Strong (decades of data) | Moderate (growing) | Emerging (promising) |
| Side effects | Cartilage damage with repeated use, skin changes | Mild pain at injection, rare allergic reaction | Flare for 1-2 weeks, minimal other risks |
| Repeat injections | Limited to 2-3 per year | Can be repeated safely | Can be repeated (usually 2-3 per year) |
| Insurance coverage | Usually covered | Rarely covered for hand | Almost never covered |
| Cost per injection | $50-150 (with insurance) | $200-500 | $300-800 |
Cost and Insurance Reality
This is an important practical consideration:
- Cortisone is almost always covered by insurance, making it the most affordable option
- Hyaluronic acid is FDA-approved for knee arthritis and sometimes covered for that use, but coverage for the CMC joint is rare. Expect to pay $200-500 out of pocket per injection.
- PRP is considered experimental by most insurers and is almost never covered. Costs range from $300-800 per injection. Some clinics offer package deals for multiple injections.
Ask your provider upfront about costs and whether any portion might be covered. Some providers offer payment plans.
Setting Realistic Expectations
Before trying PRP or HA, keep these points in mind:
- These are not cures. Like cortisone, they manage symptoms — they do not reverse existing joint damage.
- They work best in earlier stages. If you have advanced disease (Eaton III-IV) with bone-on-bone contact, injection therapies of any kind have limited effectiveness.
- Results vary. Some patients get excellent relief; others notice little difference. There is no way to predict who will respond best.
- They should be part of a broader plan. Injections work best when combined with splinting, exercises, and activity modification — not as a standalone treatment.
- The evidence is still evolving. Larger, longer-term studies are needed before definitive recommendations can be made. Be cautious of providers who overstate the benefits.
Questions to Ask Your Doctor
- Based on my stage of arthritis, am I a good candidate for HA or PRP?
- Have you seen good results with these treatments in your patients?
- What product/preparation method do you use for PRP?
- What is the total out-of-pocket cost, including follow-up visits?
- Should I try cortisone first, or is there a reason to go directly to HA or PRP?
- If the injection does not work, what are my next options?
For a complete overview of non-surgical treatments, visit our conservative treatment guide. For information on cortisone specifically, see our cortisone injection guide. If injections are no longer providing relief, our surgical treatment guide covers the next steps.
Medical Disclaimer
This article was prepared by the Hand Health Medical Advisory Board for educational purposes only. It is based on current medical literature and clinical guidelines, but it does not replace professional medical advice. Every patient’s situation is unique. Please consult your doctor or hand specialist before making any decisions about your treatment. If you are experiencing severe or worsening symptoms, seek medical attention promptly.
Compare every treatment option side by side before making any decisions.
Treatment Comparison
