PRP injections for the foot and ankle: what the evidence says

PRP is one of the most talked-about treatments in sports medicine, and the claims range from sensible to wildly overstated. Here’s what the research actually shows for the foot and ankle, so you can decide whether it’s worth it for you.

What PRP is

A small amount of blood is drawn from your arm and spun in a centrifuge to separate its parts. The layer rich in platelets, which carry growth factors involved in healing, is collected and injected into the injured tissue, often guided by ultrasound. The whole process takes less than an hour in the office.

Where PRP helps: plantar fasciitis

For chronic plantar fasciitis that hasn’t responded to stretching, footwear and inserts, the evidence is encouraging. A meta-analysis of 15 studies comparing PRP with corticosteroid injections found:

• no advantage for corticosteroid in the short term,
• better pain relief with PRP at three, six and twelve months,
• better function with PRP at six and twelve months.^[1]

The authors cautioned that many studies had a high risk of bias, so the findings should be interpreted carefully.^[1] Still, PRP is a reasonable option for stubborn heel pain, particularly for people who want to avoid repeated steroid injections. Shockwave therapy is another well-supported option at this stage.^[5]

Where it doesn’t: Achilles tendinopathy and ankle arthritis

• Chronic Achilles tendinopathy: in a randomized trial published in JAMA, people doing eccentric exercises improved just as much with a saline injection as with PRP.^[2] A 2025 meta-analysis of randomized trials found no benefit of PRP over placebo for pain or function, and concluded it shouldn’t be used for this condition until better trials show a benefit.^[3]
• Ankle arthritis: a randomized trial found PRP injections did not improve symptoms or function over a year compared with placebo injections.^[4]

For these conditions, other treatments have better evidence. See Achilles heel-drop exercises and arthritis.

What to expect if you have PRP

• A blood draw, then the injection, in one visit.
• Soreness for a few days is common.
• You may be asked to avoid anti-inflammatory medicine around the treatment, and to protect the area for a short time.
• Improvement, if it comes, builds over weeks to months.
• PRP is often not covered by insurance; we’ll confirm your cost first.

Common questions

Is PRP the same as a cortisone shot?

No. A cortisone shot is a steroid medicine that calms inflammation. PRP is a concentrate of your own platelets, intended to support the tissue’s healing response. For stubborn plantar fasciitis, PRP gave better pain relief than steroid injections from three months onward in the pooled studies.^[1]

What about amniotic injections for heel pain?

In a network analysis of injection treatments for plantar fasciitis, dehydrated amniotic membrane injections relieved pain better than steroid injections in the first two months, but there was no information on how they did after that.^[6] At our practice, amniotic and placental products are used in an operating-room setting rather than as office injections.

How many PRP injections will I need?

It varies: studies have used one injection or a short series. We reassess a few weeks after each one before recommending another, and don’t repeat an injection that hasn’t helped.

A word on “regenerative” claims

PRP supports healing in selected conditions; it doesn’t regrow tissue. Be cautious of clinics that promise it will fix everything. We’ll tell you plainly whether it’s likely to help your problem. See regenerative medicine, where we also explain the amniotic and bone marrow treatments used in surgery.

When to see a podiatrist