Does PRP work for plantar fasciitis? Pain yes, foot function no

PRP beats the main alternatives on pain and ties with them on function. A pooled analysis of 21 randomised controlled trials - studies that assign patients to one treatment or another by chance, so the groups are comparable - covering 1,356 patients with plantar fasciitis found PRP reduced pain more than three rival treatments [2]. Plantar fasciitis is wear and inflammation of the plantar fascia, the thick band of tissue that runs along the sole from the heel to the toes.

The three it beat on pain were corticosteroid injections (anti-inflammatory steroid shots into the heel), extracorporeal shock wave therapy (pulses of sound energy aimed at the heel from outside the body), and a placebo injection, meaning one with nothing active in it [2]. PRP also scored better than steroid injections and placebo on the American Orthopaedic Foot and Ankle Society's rating scale for the ankle and the back of the foot [2].

On everything that was not pain, the advantage vanished. Measured on the Foot Function Index, a score of how well the foot works, PRP was no better than shock wave therapy, steroid injections, injections of sugar solution, or meridian trigger point treatment [2]. Nor did it thin the plantar fascia more than those comparators did [2]. The one treatment it clearly outperformed on both counts was phonophoresis, which uses ultrasound to drive a drug through the skin [2].

The widely quoted success rates come from a weaker kind of study:

• 163 patients given a single injection: 80.3% counted as a success at 12 weeks, with better odds in people whose symptoms had lasted under 12 months [3]
• 140 patients aged 25 to 65 who had not responded to other treatment: 131 of them, 93.57%, improved by three months, and age affected whether it worked [4]
• 25 patients with long-standing heel pain: average pain fell from about 9 to under 2 on a 0-to-10 scale, 88% were completely satisfied, and nobody had a complication over an average of 10 months of follow-up [6]

None of those three studies included a group that got anything else, so there is no way to tell from them how many of those patients would have improved without the injection [3][4][6].

One analysis tried to rank every option at once. It pooled 32 studies and 2,390 patients using a network meta-analysis, a method that compares treatments never tested against each other directly by linking them through the comparisons they share [5]. At three months PRP came out top of the ranking - but the range of results each treatment could plausibly have produced still included no benefit at all, so none of them, PRP included, could be separated from a placebo [5]. At one month, acupuncture headed the same ranking [5].

Where PRP sits in the running order is clearer than how well it works. A 2025 review sorted 30 plantar fasciitis treatments into four stages and puts PRP in the third, the specialised tier, after rest, stretching and orthotics, and after shock wave therapy, with surgery held back for cases nothing else touches [1].

PRP is a way of putting your own repair signals into tissue that is not mending. Blood is drawn, spun in a centrifuge so the platelets separate from the rest of it, and the platelet-rich fraction goes back into the injured tissue [4][6]. Studies call this autologous, which means the material came from the same person it goes back into.

Platelets are loaded with growth factors, the proteins that tell cells to multiply and rebuild. Concentrating them is meant to restart a repair process that has stopped on its own [4][6].

The imaging suggests something does change in the tissue. In the 25-patient study, ultrasound scans showed shifts in both the thickness of the plantar fascia and its signal intensity, meaning how bright the tissue appears on the scan [6].

That reading sits awkwardly with the pooled trials. PRP did not shrink the fascia more than steroid injections or shock wave therapy did [2], so whatever explains the pain difference, it is not a bigger change in the tissue itself.

The gap between the two kinds of evidence is the main caveat. The studies reporting 80% and 93.57% success gave the injection to every participant [3][4], and the 25-patient before-and-after study did the same [6]; designs like that cannot separate the treatment from recovery that would have happened anyway.

PRP is also not one thing. Platelet concentration, injection volume and what gets added to it differ from trial to trial, and the authors of the 21-trial analysis call for a standard approach to both preparation and measurement before results can be compared properly [2].

The follow-up is short. Pain was checked at 12 weeks in one study [3] and at three months in another [4]; the longest, averaging about 10 months, had 25 patients in it [6]. Nothing here follows patients past the first year. The ranking analysis also mixed in studies that were not randomised and searched the literature up to October 2020 [5].

Who this evidence does not describe:

• children and teenagers - the 140-patient study enrolled adults aged 25 to 65 only [4]
• people who have not tried first-line treatment, since participants in both cohort studies had already failed it [3][4]
• pregnant women, people taking anticoagulants (medicines that thin the blood), and people with a generalised inflammatory disorder, previous foot surgery or a tumour in the lower limb, all of whom were excluded [4]
• anyone whose heel pain has not been identified, because the 2025 review lists conditions mistaken for plantar fasciitis, among them tarsal tunnel syndrome, a squeezed nerve at the ankle, and a calcaneal stress fracture, a hairline crack in the heel bone [1]

An injection into the heel is a procedure someone performs on you, so whether it is a sensible next step is a question for the doctor who can examine the foot.

Regenerative and longevity clinics list PRP among their injection services, and in the published studies the procedure is brief: blood out of the arm, a spin in the centrifuge, and the concentrate injected at the most tender point on the inner side of the heel [4].

Two of the studies used one injection each and measured pain at three months and at 12 weeks [3][4]. Both of those studies enrolled people who had already tried the standard first steps and got nowhere [3][4], and the 2025 treatment framework places PRP in its third tier, after rest, stretching, orthotics and shock wave therapy [1].