If you have a painful knee, shoulder, or hip, there’s a good chance someone has offered you a cortisone shot — and a good chance it helped, at least for a while. Steroid injections are one of the most common procedures in all of medicine for a reason: they’re quick, inexpensive, widely available, and they often take the edge off a flare within days. Patients ask me about them constantly. But the question I hear more and more is a sharper one: are these shots actually good for my joint, or am I trading a few good months for long-term damage?
It’s a fair question, and the honest answer has gotten more nuanced over the past several years as better long-term data has come in. I’m Dr. Rainier Guiang, a board-certified pain management physician and the director of regenerative medicine at University Pain Consultants in Riverside. I still use corticosteroid injections in the right situations — they remain a useful tool. But I also think patients deserve a clear-eyed picture of what repeated steroids do over time, and why platelet-rich plasma (PRP) has become an appealing alternative for a growing number of people. Here’s the measured version.
What a cortisone injection actually does
Cortisone is a corticosteroid — a powerful anti-inflammatory medication. When it’s injected into or around a joint, it suppresses the local inflammatory response that’s driving much of your pain. That’s why relief can feel almost dramatic: within a few days, a swollen, angry joint can quiet down considerably.
The key word, though, is suppresses. A steroid injection turns down the inflammation, but it does nothing to repair the underlying problem — the worn cartilage, the irritated tendon, the degenerating joint surface. It’s a smoke alarm being switched off, not a fire being put out. For an acute flare, that can be exactly what you need to get moving again and back into physical therapy. The trouble starts when a short-term fix becomes a long-term pattern.
The short-term win, and the long-term question
The relief from a cortisone shot is real, but it tends to be temporary. Most studies find the benefit is strongest in the first several weeks and fades by around three months. That, by itself, isn’t a problem — plenty of effective treatments are temporary. The concern is what happens when patients come back for injection after injection, year after year, because nothing is addressing the underlying joint.
That’s where the research has become harder to ignore.
What the evidence says about long-term joint effects
Several lines of evidence now point in the same direction: repeated corticosteroid injections may, over time, be associated with more joint deterioration rather than less.
- A landmark randomized trial. In a two-year study published in JAMA in 2017, patients with knee osteoarthritis who received a triamcinolone (steroid) injection every three months lost significantly more cartilage volume than those who received saline — and they had no better pain relief to show for it at the end of the two years.
- Newer imaging data. A 2025 study reported through Radiology used MRI to track patients over two years and found that corticosteroid injection was associated with greater progression of structural joint damage, particularly in cartilage, compared with patients who received hyaluronic acid or no injection.
- The Osteoarthritis Initiative. Analyses from this large, long-running cohort have linked corticosteroid injections — especially repeated ones — with faster radiographic progression of knee osteoarthritis, measured as joint-space narrowing and worsening grade.
- Comparative reviews. A 2024 systematic review and meta-analysis in EFORT Open Reviews found that the clinical benefit of steroid injections for knee osteoarthritis was similar to hyaluronic acid and lower than PRP — while PRP carried none of the cartilage-related concerns.
At the laboratory level, this fits with what we understand about how corticosteroids behave in cartilage. In cell and tissue studies, steroids can be toxic to chondrocytes — the cells that maintain cartilage — and can shift the joint toward breaking cartilage down rather than maintaining it. None of this means a single, well-timed injection will ruin your knee. It does mean that the casual “let’s just keep doing cortisone every few months” approach deserves real scrutiny.
It’s not only the joint — the rest of the body matters too
Because corticosteroids are potent hormones, their effects don’t stay perfectly contained in the joint. With repeated or frequent injections, the recognized risks include:
- Blood sugar spikes — a meaningful issue for anyone with diabetes or prediabetes, sometimes lasting days to weeks.
- Bone loss — frequent steroid exposure is associated with reduced bone density over time, which matters for fracture risk.
- Adrenal suppression — enough steroid, often enough, can blunt the body’s own cortisol production.
- Local effects — thinning of skin or fat at the injection site, loss of pigment, and, rarely, tendon weakening.
This is why most guidelines advise limiting steroid injections — often to no more than three or four in a given joint per year, and frequently fewer. If you’ve lost count of how many cortisone shots you’ve had, that’s a conversation worth having with your physician.
Why PRP is a fundamentally different approach
Platelet-rich plasma flips the underlying logic of treatment. Instead of suppressing inflammation with a drug, PRP uses a concentrated portion of your own blood — rich in platelets and the growth factors they release — to try to support the joint’s natural repair and regulate inflammation more constructively. We draw a small sample of your blood, concentrate the platelets in a centrifuge, and inject that concentrate precisely where it’s needed, often under ultrasound guidance.
Two things make PRP conceptually appealing as an alternative to long-term steroids. First, it’s autologous — it comes from you, so there’s no foreign drug and an exceptionally low risk of allergic reaction. Second, its goal isn’t just to mute symptoms but to nudge the joint environment toward healing. It’s working with the biology rather than overriding it.
What the research actually shows about PRP
I want to be careful here, because PRP is an area where marketing often outruns the data. So here’s the honest read of the better-quality evidence, particularly for knee osteoarthritis, where it’s been studied most:
- It tends to last longer than steroid. Across multiple randomized trials and meta-analyses, PRP and cortisone perform similarly in the first few weeks, but PRP’s benefit holds up better at the 6- and 12-month marks, while the steroid effect typically fades after a few months.
- It compares favorably head-to-head. In several reviews comparing the two directly, PRP matched or outperformed corticosteroid injections for pain and function at longer follow-up.
- Its safety profile is strong. Because it’s your own blood, serious adverse events are rare. The most common side effect is temporary soreness or swelling at the injection site for a day or two.
- It doesn’t carry the cartilage-loss signal. Unlike repeated steroids, PRP hasn’t been associated with accelerated cartilage breakdown in the imaging studies done so far.
I cover the specifics for the knee in more depth in my evidence-based guide to PRP for knee pain, and answer the most common patient questions on our PRP/PRF therapy FAQ.
The honest limitations of PRP
PRP isn’t magic, and it isn’t right for everyone. A few caveats I always share:
- It’s usually not covered by insurance, so it’s an out-of-pocket cost — a real consideration that cortisone, which is typically covered, doesn’t carry.
- Preparation methods vary between clinics, and that variability is one reason study results aren’t perfectly consistent. How the PRP is made matters.
- It generally works best in earlier-to-moderate joint disease; it’s not a substitute for joint replacement in severe, bone-on-bone arthritis.
- Relief is usually gradual, not instant — it builds over weeks as the biology responds, rather than the rapid quieting you get from a steroid.
How I think about it in practice
This isn’t really a story of “good shot versus bad shot.” Corticosteroid injections still have a legitimate place — for an acute, miserable flare, or to create a window of relief so you can engage in rehab, a single well-placed steroid injection can be the right call. What the evidence has changed is the idea that repeated cortisone is a harmless long-term maintenance strategy. For many patients, it isn’t.
If you find yourself returning for shot after shot, that’s the moment to step back and ask whether a regenerative approach like PRP — one that aims to support the joint rather than progressively wear it down — fits your situation better. The right answer depends on your specific diagnosis, the severity of your joint disease, your other health conditions, and your goals. That’s a shared decision, and it should be made with a physician who can examine you and review your imaging.
Frequently asked questions
Are cortisone shots bad for your joints?
An occasional, well-timed cortisone injection is generally considered safe and can be genuinely helpful for a flare. The concern is with frequent or repeated injections over time, which several studies have linked to faster cartilage loss and joint-space narrowing — without better long-term pain relief to justify it.
How many cortisone injections are safe in one joint?
Most guidelines suggest limiting injections in a single joint to roughly three to four per year, and many physicians recommend fewer. If you’re approaching or exceeding that, it’s worth discussing alternatives rather than simply continuing the cycle.
Is PRP better than a cortisone shot?
For knee osteoarthritis, the better-quality evidence suggests PRP and cortisone work similarly in the very short term, but PRP’s benefit tends to last longer — out to 6 to 12 months — and it isn’t associated with the cartilage concerns seen with repeated steroids. “Better” still depends on your situation, but PRP is increasingly favored when the goal is durable relief rather than a quick, temporary fix.
Does PRP hurt, and is it safe?
Because PRP uses your own blood, serious reactions are rare. Most people feel some soreness or swelling at the injection site for a day or two, which then settles. We use local anesthetic and, when appropriate, ultrasound guidance to make the procedure as comfortable and precise as possible.
Is PRP covered by insurance?
In most cases PRP is not covered and is paid out of pocket. We’re happy to walk through the cost and what to expect during a consultation so you can weigh it against the cost — financial and otherwise — of ongoing steroid injections.
The bottom line
Cortisone injections are a useful tool, not a villain — but the long-term data has made one thing clear: they’re best used sparingly, for the right moment, rather than as a standing fix that quietly chips away at the joint you’re trying to protect. PRP offers a different bargain. It asks for more patience and usually an out-of-pocket cost, but it aims to support healing instead of suppressing symptoms, lasts longer in the studies we have, and doesn’t carry the cartilage-loss signal that repeated steroids do. For the right patient, that’s a trade worth understanding.
If you’ve been relying on cortisone shots and you’re wondering whether there’s a healthier long-term path, I’d be glad to talk it through. You can book a consultation or contact our office to see whether PRP makes sense for your joint.
Dr. Rainier Guiang, MD, is board-certified in Anesthesiology and Pain Medicine and serves as director of regenerative medicine at University Pain Consultants, serving Riverside and the Inland Empire.
Medical disclaimer: This article is for general educational purposes and does not constitute medical advice or establish a physician-patient relationship. Corticosteroid injections, PRP, and other treatments carry individual risks and benefits that depend on your specific health circumstances. Please consult a qualified healthcare provider before making decisions about your care.
