If you have had a cortisone shot for a sore knee, shoulder, or elbow, you may know the pattern. The relief can be fast and real. Then, weeks or months later, the pain drifts back, and you wonder whether another shot is the answer. So you start reading about platelet-rich plasma (PRP), and the internet splits in two: one article says PRP beats steroids, the next says the evidence is weak and cortisone works just as well.
Both camps can point to real studies. Four papers published in 2026 help explain why, and the explanation is simpler than most people expect: the answer depends on when you measure.
What each injection is designed to do
A corticosteroid injection (“cortisone”) is a potent anti-inflammatory medication placed into or near a painful structure. It is designed to calm inflammation quickly, which is why many people feel better within days.
PRP works on a different idea. A small amount of your own blood is drawn, spun in a centrifuge to concentrate the platelets, and injected into the joint or tendon. Platelets carry growth factors and signaling proteins, and the goal of treatment is to support the body’s own repair and inflammation-regulating processes over time. That is a slower process by design, which matters a great deal when you read the research.
What the 2026 research found
Tennis elbow: cortisone ahead early, PRP ahead later
A randomized trial in the Orthopaedic Journal of Sports Medicine assigned 48 people (50 elbows) with chronic lateral elbow tendinopathy to a single ultrasound-guided PRP injection or a corticosteroid injection, then followed them for a year. At 4 and 8 weeks, the steroid group was doing clearly better. By 12 weeks the gap had closed. At 6 and 12 months, scores favored PRP, and pain scores averaged about 1.5 points lower in the PRP group across the study. The authors concluded that corticosteroids gave greater short-term improvement while PRP showed better longer-term outcomes. One honest caveat: on the study’s main elbow score, the later differences did not reach conventional statistical significance, so this is a signal, not a verdict.
Frozen shoulder: a tie at one month, PRP ahead at three and six
A 2026 meta-analysis in the Journal of Back and Musculoskeletal Rehabilitation pooled 7 randomized trials with 692 participants comparing PRP with corticosteroid for primary frozen shoulder. Up to one month, the two performed about the same. At 3 and 6 months, PRP showed statistically better pain, function, and range of motion. Complications were rare and nearly identical (0.86% with PRP, 0.87% with steroid). The authors rated the evidence low to moderate and asked readers to interpret the findings cautiously.
Knee osteoarthritis: PRP ahead at six and twelve months
The largest analysis, in International Orthopaedics, pooled 62 randomized trials and 4,969 patients. PRP improved pain and function compared with hyaluronic acid, corticosteroid, and saline at six months, and stayed ahead of hyaluronic acid and corticosteroid at twelve months. The caveats are significant: the trials varied enormously (heterogeneity above 90% for most analyses), and certainty ranged from moderate to very low.
A smaller 2026 randomized trial in the Journal of Orthopaedic Surgery and Research looked at advanced, “bone-on-bone” type knee arthritis in 90 patients already on a waiting list for knee replacement. Two PRP injections a week apart were compared with a single steroid injection or an anti-inflammatory tablet. At 3 and 6 months, the PRP group had lower pain, better function scores, and used less opioid pain medication. The authors described PRP as a possible “bridge” therapy before joint replacement, not a replacement for it.
Why the internet disagrees: it is mostly the clock
Put those four papers side by side and the contradiction starts to dissolve. Steroids tend to look best in the first weeks. PRP tends to look best from about three months onward. So a study that checks results at four weeks can fairly report that cortisone wins, while a study that checks at six or twelve months can fairly report that PRP wins. Neither is wrong. They are answering different questions.
Notice also that the knee trial above measured outcomes at 3 and 6 months only, so it could not capture the early window where steroids led in the other studies. When you read any headline about PRP versus cortisone, the first question to ask is simply: measured when?
What the research does not settle
This is not a clean win for either side. Several of these analyses rate their own certainty as low or very low, and the trials used different PRP preparations, volumes, and injection schedules. The knee meta-analysis found that trials drawing more blood (40 mL or more) tended to report larger improvements compared with hyaluronic acid, which suggests preparation matters, but it could not confirm why. We explored that problem in more depth in why PRP results vary so much from patient to patient.
It is also fair to say that cortisone has a legitimate role. When fast relief is the priority, the research above suggests it often delivers that relief sooner. The better question is not which injection is “best,” but which one fits your goal and your timeline.
Questions to ask before either injection
- What is the goal? Relief in the next few weeks, or a longer-term change in how the joint or tendon functions?
- Is the injection image-guided? The tennis elbow trial used ultrasound guidance to place the PRP precisely.
- How is the PRP prepared? Ask how much blood is drawn and how many injections are planned.
- What happens to my anti-inflammatory medications? Ask what to take, and avoid, before and after PRP.
- What is the plan beyond the injection? Strength, movement, and load management are part of any joint or tendon plan.
Who is generally not a good candidate for PRP
Being honest about this is part of doing the procedure well. Candidates are typically evaluated for the following, and PRP is often not the right choice for people who:
- have an active infection in or near the area to be treated
- have certain blood or platelet disorders, or significant anemia
- are undergoing active cancer treatment
- are pregnant
- need relief within a few weeks for a specific event, since PRP is a slower-acting approach
- have severe joint damage where a surgeon has recommended replacement soon; PRP may be discussed as a bridge, not a substitute
Blood thinners and anti-inflammatory medications also need to be discussed before treatment. None of this is a decision to make from an article; it is what a consultation is for.
How Venturis approaches PRP in Oklahoma City
Venturis founder Dr. Alvin Philipose spent more than 25 years in regenerative and functional medicine. At Venturis Clinic, PRP therapy is one option within a broader plan that may include prolotherapy, prolozone, and rehabilitation, depending on what the evaluation shows. If you are weighing options for a painful knee, our overview of regenerative knee pain treatment in Oklahoma City is a good next read.
Frequently asked questions
Is PRP better than a cortisone shot?
It depends on the timeframe. 2026 research suggests cortisone often gives faster relief in the first weeks, while PRP tends to show better results from about three months onward in knee arthritis, frozen shoulder, and tennis elbow. Results vary, and the certainty of the evidence ranges from moderate to very low.
How long does it take for PRP to start working?
PRP is slower-acting than cortisone. In the 2026 studies, differences in favor of PRP generally appeared at around three months or later rather than in the first few weeks. Patients may experience changes on a different timeline, which is why follow-up matters.
Why did my cortisone shot stop working?
In the tennis elbow trial, the steroid group’s early advantage faded by about 12 weeks. Cortisone is designed to calm inflammation quickly, not to change the underlying tissue, so it is not surprising when relief fades. A provider can help sort out why it happened in your case.
Can I get PRP after a cortisone injection?
Often, yes, but timing is worth discussing. Steroids suppress inflammation, and PRP is thought to work partly through a controlled inflammatory response, so ask your provider how long to wait after a recent steroid injection.
Can PRP help bone-on-bone knee arthritis?
A 2026 randomized trial in patients with advanced knee arthritis awaiting joint replacement found that two PRP injections reduced pain and opioid use at 3 and 6 months compared with a steroid injection or an anti-inflammatory tablet. The authors framed PRP as a possible bridge before surgery, not a substitute for it.
Is PRP FDA-approved?
The devices used to prepare PRP are FDA-cleared for preparing it, but PRP injection for joint or tendon pain is not an FDA-approved indication. It is used as a physician-directed, off-label procedure, and results vary.
Where can I get PRP therapy in Oklahoma City?
Venturis Clinic offers PRP therapy at 7917 N May Ave, Suite B, in Oklahoma City, and sees patients from Edmond, Norman, Moore, Yukon, Mustang, and the surrounding metro. You can book a free 15-minute phone consultation to see whether PRP fits your situation.
Talk it through before you choose
If you are deciding between another cortisone shot and trying PRP, the most useful step is a conversation about your goal and your timeline. Request an appointment or book a free 15-minute phone consultation with our Oklahoma City team.
Venturis Clinic
7917 N May Ave, Suite B, Oklahoma City, OK 73120
(405) 848-7246
This content is for educational purposes only and is not medical advice, diagnosis, or treatment. Individual results vary and no outcome is guaranteed. Venturis Clinic offers regenerative, functional, and alternative medicine services; some therapies discussed are not FDA-approved for the uses described. Talk with a qualified healthcare provider about your specific situation before beginning any treatment.
Sources
- Wilson JJ, Lee KS, Erickson R, Kliethermes S. A randomized controlled trial of 1-year clinical outcomes of a single platelet-rich plasma injection versus corticosteroid for the treatment of lateral elbow tendinopathy. Orthopaedic Journal of Sports Medicine. 2026;14(1). doi:10.1177/23259671251386862
- Peng R, Chen H, Li P. Platelet-rich plasma vs corticosteroid for primary frozen shoulder: meta-analysis of randomized trials. Journal of Back and Musculoskeletal Rehabilitation. 2026;39(3):775–790. doi:10.1177/10538127251412669
- Centeno CJ, Berger DR, Pelle AJ, Dodson E, Hernigou P, Murphy MB. Autologous platelet-rich plasma versus hyaluronic acid, corticosteroids or saline for knee osteoarthritis: can blood draw volume serve as a proxy for platelet dose? A systematic review and meta-analysis. International Orthopaedics. 2026;50(5):981–997. doi:10.1007/s00264-026-06782-7
- Lacko M, Awad O, Matúška M, et al. Intra-articular platelet-rich plasma demonstrates superior clinical and serum biomarker outcomes compared with corticosteroids and NSAIDs in late-stage knee osteoarthritis: a randomised controlled trial. Journal of Orthopaedic Surgery and Research. 2026;21:453. doi:10.1186/s13018-026-07013-w
