PRP is the treatment everyone has heard of. It is offered in sports clinics around the world, often with a confident promise and a price to match. We think athletes deserve a calmer view: what platelet-rich plasma and other injections can reasonably do, where the best trials found little or no benefit, and how to judge an offer before you pay for it.
What PRP is
Platelet-rich plasma is made from your own blood. A small sample is spun in a centrifuge to concentrate the platelets, which carry growth factors involved in healing. The concentrate is then injected into a tendon, muscle or joint, often guided by ultrasound.
The idea is attractive, and because it comes from your own blood it is generally low risk. But "natural" is not the same as "proven". Preparations differ widely between clinics — in platelet count, white cells and how it is injected — which makes results hard to compare.
For tested athletes there is one point in PRP's favour: platelet-rich plasma is not prohibited by WADA, although individual growth factors are. Read anti-doping and treatment abroad.
Where good trials found little or no benefit
The most useful studies compare PRP with a placebo injection, so neither patient nor assessor knows who had what. Several large, well-run trials have done exactly that.
| PRP injections | 2.1 pts |
|---|---|
| Saline placebo injections | 1.8 pts |
Bennell et al., JAMA, 30 November 2021 (288 people, three injections each). The difference was not statistically significant (P = .17). Cartilage volume also did not differ.
- Knee osteoarthritis: both groups improved — the placebo effect of injections is strong — but PRP did no better than salt water.
- Tennis elbow: a Cochrane review of 32 trials found little or no clinically important benefit over placebo, and concluded the data do not support these injections.
- Achilles tendon rupture: PATH-2, a UK trial of 230 adults, found PRP did not improve function or quality of life at two years.
- Hamstring muscle tears: a Dutch trial of 80 athletes found no faster return to play and no difference in re-injury at one year.
Why, then, do so many people say PRP helped them? Three honest reasons. Many tendon and muscle problems improve with time anyway. Injections of any kind, including salt water, have a strong placebo effect, as the RESTORE results show. And PRP is usually given alongside rest and rehabilitation, which do a lot of the work. None of this means people are imagining their recovery — only that the injection may not be what caused it.
Where it may still have a role
Honest evidence is not the same as "never". Some smaller trials report benefit, especially in knee osteoarthritis, and guidance from the American Academy of Physical Medicine and Rehabilitation suggests PRP may be considered for knee osteoarthritis after standard conservative treatments have failed.
In practice, PRP is a reasonable conversation when you have done the basics properly — load management, a structured strengthening programme, weight and footwear where relevant — and you understand the uncertainty and the cost. It should not replace rehabilitation, and it should not be sold as a cure.
Other injections athletes are offered
- Corticosteroid (cortisone): can calm pain and inflammation for weeks, which may help a rehab programme get going. Repeated injections into tendons are generally avoided, and timing must respect anti-doping washout periods.
- Hyaluronic acid: a lubricant injected into arthritic joints. Results vary, and it is not a treatment for acute sports injuries.
- Prolotherapy and other "regenerative" injections: the evidence is limited; ask for the trials behind any claim.
- "Stem cell" injections: in India, national guidelines state that no stem cell administration to humans is permissible outside approved clinical trials, apart from approved blood-disorder treatments. Be wary of any clinic selling them as routine care.
How to judge an injection offer
- Diagnosis firsta clear diagnosis from examination and imaging
- Rehab tried?a proper strengthening programme, usually for weeks to months
- Ask for the evidenceplacebo-controlled trials for your exact condition
- Anti-doping checkgeneric name, dose and timing if you are tested
- Agree the plan afterthe injection supports rehab; it does not replace it
Good questions to ask the doctor:
- What result do you expect, and by when? What if it does not work?
- How is the PRP prepared, and will you use ultrasound guidance?
- How many injections, at what total cost?
- What would you do if this were your own knee, tendon or shoulder?
We will never push an injection or a surgery. A US$99 consultation gives you two calls with a specialist — useful for a second opinion on an injection plan before you spend on it. Start with our sports medicine guide, read why we don't push surgery, or book a consultation.
Independent research. Figures are quoted from the official and published sources listed below, as they stood when we checked them (October 2026). BookMedTrip is an independent facilitator and is not affiliated with any government body, hospital, charity or organisation named here, and receives no commission from them. If anything here is out of date or inaccurate, please write to care@bookmedtrip.com and we will correct it.
Preguntas
Does PRP work for knee osteoarthritis?
In the large RESTORE trial, PRP was no better than saline for pain or cartilage at 12 months. Some smaller studies report benefit, and some guidance suggests considering it only after standard treatments fail.
Is PRP effective for tennis elbow?
A 2021 Cochrane review of 32 trials found little or no clinically important benefit over placebo and does not support its use.
Is stem cell therapy for sports injuries legal in India?
Indian national guidelines state that stem cell administration to humans is not permissible outside approved clinical trials, apart from approved blood-disorder treatments.
Fuentes
- JAMA — Effect of intra-articular PRP vs placebo injection on pain and medial tibial cartilage volume in knee OA: the RESTORE trial (Bennell et al., 30 Nov 2021)
- Cochrane — Autologous blood or PRP injection for lateral elbow pain (30 Sep 2021)
- Bone & Joint Journal — PRP for acute Achilles tendon rupture: two-year follow-up of PATH-2 (Nov 2022)
- BJSM — One-year follow-up of a randomised trial of PRP in acute hamstring injury (Reurink et al., 2015)
- AAPM&R — Platelet-rich plasma for knee osteoarthritis guidance (evidence to June 2025)
- Nature India — New guidelines restrict stem cell therapy (11 Oct 2017)
