PRP vs. Cortisone for Tennis Elbow: What the Trials Actually Show

A cortisone shot for tennis elbow can feel like a quick fix — but the research shows the trade-off is real. Here is how cortisone and PRP compare over weeks, months, and years, so you can choose with your eyes open.

Tennis elbow is one of the most frustrating tendon problems to treat. The pain sits on the outer elbow, flares with gripping and lifting, and often drags on for months. When it does not settle on its own, the two injections most often discussed are cortisone (a corticosteroid) and PRP (platelet-rich plasma). They work in almost opposite ways, and the research comparing them tells a surprisingly clear story.

This post walks through what tennis elbow actually is, how the two injections differ, and what the head-to-head trials show over time — so the choice feels like an informed decision rather than a coin flip.

What tennis elbow really is

Despite the name, most people with tennis elbow have never picked up a racket. The medical term is lateral epicondylitis, and it involves the tendon that attaches your forearm muscles to the bony bump on the outside of the elbow. Years of research have shown that in stubborn, long-standing cases the problem is not classic inflammation — it is a failure of the tendon to heal properly, leaving disorganized, degenerated tissue behind.

That detail matters, because it explains why an anti-inflammatory shot and a healing-focused shot produce such different results over time.

How the two injections work

Cortisone is a powerful anti-inflammatory. It calms the irritated tissue quickly, which is why it can bring fast relief. But it does not repair the tendon, and there is evidence that repeated cortisone can weaken tendon tissue over time.

PRP takes the opposite approach. A small sample of your blood is concentrated to gather its healing platelets, which are then injected — under ultrasound guidance — into the injured tendon to prompt an actual repair response. It does not work overnight; it works over weeks to months as the tendon rebuilds.

What the trials show over time

This is where the comparison gets interesting, and the timing is everything.

In the first month or so, cortisone often wins. Several trials show it provides quicker early pain relief than PRP. If all you measured was the first few weeks, cortisone would look like the better option.

But the picture flips after that. By around three months, and consistently out to one and even two years, PRP produces better pain relief and function than cortisone. Multiple randomized trials and reviews point the same direction: cortisone fades, and in some studies the cortisone group ends up worse off long-term than if they had done less. PRP, by contrast, tends to hold or keep improving as the tendon heals.

In plain terms: cortisone borrows relief from the future, while PRP invests in it.

So which one is right for you?

The honest answer is that it depends on your situation, and this is a genuine strength of tennis elbow as a condition — the evidence is strong enough to guide a real decision rather than a guess. If your tennis elbow is recent and mild, it may settle with load management, a targeted strengthening program, and time, without any injection at all. That is always worth trying first.

PRP tends to make the most sense for the cases that have not budged — pain that has lasted months, has not responded to rehab, or has already been through one or more cortisone shots without lasting improvement. Those are exactly the situations where the long-term advantage of PRP matters most.

There is real reason for optimism here. Tennis elbow that has dragged on for months is not a dead end, and it rarely requires surgery. With the right plan — and, when appropriate, a healing-focused injection — most people get back to gripping, lifting, and using the arm without that nagging outer-elbow pain.