Cortisone and PRP answer different questions. A corticosteroid injection quiets inflammation fast, and in randomized trials its advantage peaks in the first weeks, then fades. Platelet-rich plasma works slower: a 2021 meta-analysis in BMC Musculoskeletal Disorders found PRP ahead of corticosteroid injections for knee osteoarthritis at 3, 6, and 9 months. In a JAMA trial of tennis elbow, recurrence one year after cortisone was 54%, versus 12% with placebo. At Dynamic Athlete in Boulder, Colorado, Aneesh Garg, DO, CAQ uses both where each belongs, and performs high-dose Dynamic PRP+ (over 10 billion platelets, live ultrasound) when durability is the goal.
This page is the second opinion for the patient who has already had the cortisone conversation and wants the longer view: what each injection actually does, what the randomized trials measured at one month and at one year, and how a physician decides between them.
The Decision
If your priority is the next four weeks, cortisone is a legitimate tool and we say so. It is fast, usually insurance-covered, and can settle a flare enough to sleep, work, and start rehab. That is a real clinical job, and there are cases where Dr. Garg recommends exactly that.
If your priority is next season, the calculus changes. Repeat steroid exposure carries a documented tissue cost in the knee, and PRP’s trial advantage appears from month three onward. Bring your imaging and your injection history to the evaluation; the plan is mapped to your tissue, not to a menu.
Key Takeaways
- Cortisone wins the first month. Across comparative trials, corticosteroid injections relieve pain fastest, with the advantage concentrated in the early weeks.
- PRP wins the longer follow-ups. A 2021 meta-analysis (BMC Musculoskeletal Disorders) found PRP ahead of corticosteroids for knee osteoarthritis at 3, 6, and 9 months.
- Repeat cortisone has a measured cost in the knee. In a 2-year JAMA trial, triamcinolone every 3 months produced greater cartilage volume loss than saline, with no pain advantage.
- Dose decides whether PRP is worth it. A randomized study tied durable one-year benefit to a dose near 10 billion platelets. Dynamic PRP+ concentrates platelets 12–20x baseline, over 10 billion, under live ultrasound.
- With Dynamic PRP+, over 90% of our patients self-report a 75% or greater improvement, all without surgery. HSA and FSA dollars typically apply, and Cherry financing can spread the investment.
One Year After Injection · JAMA 2013, Tennis Elbow
54% vs 12%
In the Coombes randomized trial, patients who received a corticosteroid injection had a 54% recurrence rate at one year. The placebo group: 12%. The fast relief is real. So is the rebound.
What did the randomized trials actually measure?
Four findings, each from a named study, carry this comparison.
Cortisone treats the pain signal, not the tissue
A corticosteroid suppresses inflammatory signaling. That is why relief arrives in days and why it ends: the tissue underneath is unchanged. In a double-blind randomized trial (Cureus, 2022), PRP and corticosteroid both improved knee arthritis through six months with no significant difference. The separation shows up later.
PRP’s advantage appears from month three onward
Pooled data points one direction. The 2021 McLarnon meta-analysis in BMC Musculoskeletal Disorders found PRP ahead of corticosteroid injections for knee osteoarthritis at 3, 6, and 9 months on pain, stiffness, and function. PRP is the slower instrument, and in these trials the one still working when the calendar turns.
The one-year data rarely makes it into the exam room
Two JAMA trials frame the long view. Coombes (2013): one year after a cortisone shot for tennis elbow, full recovery was less frequent than with placebo (83% vs 96%) and recurrence far more frequent (54% vs 12%). McAlindon (2017): triamcinolone every three months for two years produced greater knee-cartilage volume loss than saline, with no pain benefit. Fast relief is a fact. So is what follows it.
Dose decides whether the PRP comparison is even fair
A syringe labeled PRP does not state its dose. Ours does. A 2021 randomized study in Scientific Reports tied durable one-year benefit in knee osteoarthritis to a dose near 10 billion platelets. A standard single-spin preparation concentrates platelets 2–3x. The high-dose Dynamic PRP+ protocol is multi-spin, 12–20x baseline, over 10 billion platelets with Exosome-Containing Fibrin-Rich Plasma, performed exclusively by Dr. Garg under live ultrasound.
How do cortisone and Dynamic PRP+ compare side-by-side?
| Property | Cortisone Injection | High-Dose PRP (Dynamic PRP+) |
|---|---|---|
| What it is | Anti-inflammatory steroid | Your own platelets, concentrated 12–20x |
| Time to relief | Days; peaks in early weeks | Weeks; builds over months |
| Trial pattern | Leads at 1 month, fades | Ahead at 3, 6, 9 months (pooled knee-OA data) |
| Repeat-use profile | Cartilage loss documented with repeated knee use (JAMA 2017) | Autologous; series planned by the physician |
| Delivery here | Physician-performed when indicated | Physician-performed, live ultrasound, every time |
| Coverage | Typically insurance-covered | Out-of-pocket; HSA/FSA and Cherry financing |
The question that settles it
Ask what you want this injection to have done by this time next year. Cortisone answers the next month. In the pooled trials, PRP answers the next year. That is the whole comparison, honestly stated, and it is why the two are not interchangeable.
Which three questions protect you at any clinic?
Print this. Ask it anywhere.
- What platelet dose, stated as a number, will my PRP contain?
- Is the injection image-guided, and is the person performing it a physician?
- If cortisone is recommended, what is the plan for when it wears off?
Frequently asked questions
What is the difference between PRP and a cortisone injection?
Cortisone is an anti-inflammatory steroid that reduces pain signals temporarily; PRP delivers your own concentrated platelets and growth factors aimed at supporting the tissue itself. They work through different mechanisms, which is part of why they tend to produce different timelines and different repeat-injection patterns.
Why does cortisone relief tend to be short-term for active adults?
Cortisone addresses inflammation and pain signaling, not the underlying tissue damage, so once its effect wears off, the original tissue problem is often still there, especially under real training or activity load. Repeated cortisone injections can also affect tendon tissue over time, which is part of why PRP is evaluated as an alternative for active patients.
Can I get PRP if I have already had cortisone injections?
In most cases, yes, though timing matters: cortisone can affect the local tissue environment for a period afterward, so Dr. Garg reviews your injection history and timing as part of the evaluation before recommending Dynamic PRP+.
Is PRP more expensive than cortisone?
Cortisone injections are typically covered by insurance as a standard in-office procedure, while PRP is an out-of-pocket regenerative treatment priced after a thorough evaluation, not off a standard fee schedule. We give a quote once your evaluation defines what your specific case needs, and Cherry financing is available if you want to spread the cost.
How long does PRP take to work compared with cortisone?
Cortisone typically works within days, with its peak effect in the first weeks after injection. PRP runs a different clock: most patients notice change over several weeks, and the comparative trials measure PRP’s advantage from month three onward, holding through months six and nine in pooled knee-osteoarthritis data. That difference is mechanical, not a defect: a steroid suppresses inflammatory signaling immediately, while PRP is aimed at the tissue’s own repair biology, which does not move in days. At Dynamic Athlete, Aneesh Garg, DO, CAQ sets that expectation before the injection, maps the recovery timeline to your sport or work demands, and schedules follow-up so progress is measured rather than guessed. Individual results vary.
If cortisone stopped helping, does that mean PRP will not work either?
No. The two injections act on different targets, so a fading cortisone response does not predict a poor PRP response. Cortisone quiets the pain signal; when it wears off, the underlying tendinopathy or joint change is usually still there, which is exactly the problem PRP is aimed at. Prior injections do matter for planning: steroid can affect the local tissue environment for a period afterward, so Dr. Garg reviews what you received, where, and when before scheduling Dynamic PRP+. Candidacy is stated honestly in both directions; some tissue problems are past what any injection should be asked to do, and if that is your case you will hear it plainly at the evaluation. Individual results vary.
What does high-dose PRP mean, and why does the dose matter?
PRP preparations differ enormously, and dose is the variable the label never shows. A standard single-spin kit concentrates platelets roughly 2-3x above baseline. A 2021 randomized study in Scientific Reports linked durable one-year benefit in knee osteoarthritis to a dose near 10 billion platelets, which a low-concentration preparation does not reach. Dynamic PRP+ is a multi-spin, high-dose protocol: platelets concentrated 12–20x baseline, over 10 billion platelets, combined with Exosome-Containing Fibrin-Rich Plasma, and delivered under live ultrasound so the dose lands on the target tissue. Every Dynamic PRP+ procedure is performed by Aneesh Garg, DO, CAQ, not delegated. When you compare PRP to cortisone, or one clinic’s PRP to another’s, ask for the platelet number first.