Platelet-Rich Plasma for Orthopedic Conditions: What Does the Research Actually Say?

Platelet-rich plasma, or PRP, has become one of the more talked-about options in non-operative orthopedic care — and also one of the more inconsistently explained. It's not a single standardized product, and it doesn't work equally well for every condition it's used for. Rather than make a blanket claim in either direction, it's worth walking through what PRP actually is and what the evidence shows, condition by condition.

What PRP Actually Is

PRP is prepared from a patient's own blood: a sample is drawn and spun in a centrifuge to concentrate the platelets, which are then injected into the injured tissue. Activated platelets release a mix of growth factors — including platelet-derived growth factor, transforming growth factor, and vascular endothelial growth factor — that are thought to help stimulate the body's own healing and inflammatory response at the site of injury.¹ Because it's autologous (made from the patient's own blood), there's no risk of an allergic or immune reaction to a foreign substance, which is part of why it's generally considered low-risk. What varies enormously from study to study, and from clinic to clinic, is how the PRP is prepared — platelet concentration, whether white blood cells are included, and injection protocol all differ, which is a big reason the research findings aren't always consistent.¹

Tennis Elbow (Lateral Epicondylitis): Favorable Long-Term Evidence

This is the condition with the most encouraging data. A 2024 systematic review and meta-analysis of randomized controlled trials comparing PRP to corticosteroid injections found that corticosteroids provided better pain relief in the short term (under two months), but PRP produced significantly better long-term (six months or more) improvement in pain, disability scores, and elbow function.² In other words, corticosteroids tend to work faster, but PRP's benefit holds up better over time — a pattern that shows up repeatedly in the tennis elbow literature.

Knee Osteoarthritis: Growing, Increasingly Favorable Evidence

The evidence base here has matured considerably. A 2025 systematic review and meta-analysis of randomized controlled trials found that PRP produced meaningfully better pain relief and functional improvement than both saline and corticosteroid injections, with the strongest effect in early-to-moderate osteoarthritis (Kellgren-Lawrence grades 1–3) rather than advanced, bone-on-bone disease.³ Other recent reviews have found PRP outperforming hyaluronic acid (viscosupplementation) as well, particularly when multiple injections are given rather than a single dose.⁴ As with tennis elbow, preparation method and dosing still aren't fully standardized across studies, which is worth keeping in mind when comparing results.

Rotator Cuff Tendinopathy: Mixed, Still Unsettled

This is the condition where the evidence is least conclusive. Recent systematic reviews and meta-analyses describe short-term pain and functional improvement with PRP for rotator cuff tendinopathy, but inconsistent long-term results, with considerable variation in study design, PRP protocol, and comparison group across the literature.⁵ One meta-analysis of PRP used as a surgical adjunct during arthroscopic rotator cuff repair did find a lower retear rate with PRP (16.5% versus 23.6%), though other trials in that same space found no difference.⁵ The honest summary is that PRP shows promise for rotator cuff pathology but hasn't yet built the same level of consistent long-term evidence that exists for tennis elbow or knee osteoarthritis.

The Takeaway: Evidence Varies by Condition

The most useful way to think about PRP isn't "does it work," but "how well does it work for this specific tissue and this specific problem." A professional sports medicine society's 2024 review of the PRP-for-osteoarthritis literature reached a similar conclusion — the evidence has strengthened meaningfully in recent years, but appropriate patient selection and realistic expectations still matter more than the treatment itself.⁶ That's the framing worth carrying into any conversation about whether PRP is a reasonable option for a particular injury.