TL;DR

Platelet-rich plasma (PRP) therapy involves drawing a small amount of a patient's own blood, concentrating the platelets by centrifuge, and injecting that concentration into an injured or degenerated area. Platelets carry growth factors that signal the body to repair tissue. It is used for tendinopathies, joint osteoarthritis, and ligament injuries, with evidence strongest for knee osteoarthritis and tennis elbow.

If you’re comparing treatments, start with the clinic’s overview of regenerative medicine options before discussing your options with a clinician.

Key takeaways

• PRP is prepared from your own blood, concentrated by centrifuge, and injected into the target tissue to support the body's natural repair process.
• Evidence for PRP varies by condition and is strongest for knee osteoarthritis and certain tendinopathies such as lateral epicondylitis.
• Careful patient and condition-specific evaluation is essential because PRP is not appropriate for every person or every diagnosis.

What Is Platelet-Rich Plasma and Where Does It Come From?

Platelet-rich plasma, or PRP, is a concentration of platelets derived from your own blood. Platelets are small cells best known for their role in clotting, but they also carry growth factors, proteins that signal the body to begin tissue repair.

When you cut yourself, platelets rush to the site and release these signaling proteins to start healing. PRP therapy takes that process and concentrates it, drawing a small sample of your blood, spinning it in a centrifuge to separate the platelets from the red blood cells, and producing a plasma solution that contains a much higher platelet concentration than normal blood. That concentrated solution is then injected into an injured or degenerated area of the body. Because the material comes from your own blood, it is classified as an autologous, meaning self-derived, biologic treatment. There is no donor tissue and no foreign substance involved. Dr. Jordan Sudberg, MD, a physiatrist and pain management specialist at Spine and Sports Rehab NY on Long Island, frames this approach within a broader philosophy: "Regenerative medicine is an area of treatment focused on using biologic approaches to support the body's natural healing processes. The right approach depends on the patient's condition, medical history, goals, and the source of their pain." That framing matters because PRP is one tool within a wider set of options, not a universal solution, and understanding where it fits starts with understanding what it is.

How PRP Is Prepared and Injected

PRP preparation takes place on the same day as the injection, usually in a clinic setting. The entire process from blood draw to injection typically takes under an hour.

A clinician draws a small volume of blood, typically between 15 and 60 milliliters depending on the protocol, into a sterile tube. The tube is placed in a centrifuge and spun at a controlled speed. Centrifugation separates the blood into layers: red blood cells settle at the bottom, a thin layer of white blood cells sits above them, and the platelet-rich plasma rises to the top. The clinician draws off this top layer and, in some protocols, performs a second spin to increase the platelet concentration further. The resulting PRP is then prepared for injection. Precision in delivery matters. Many providers use ultrasound guidance, real-time imaging that lets the clinician visualize the target tissue and confirm the needle is placed accurately. This is especially important for structures like tendons, ligaments, and joints that lie close to nerves and blood vessels. After the injection, patients are typically advised to limit heavy activity for a short period while the initial tissue response occurs. Your clinician will outline specific post-procedure guidance for your situation.

What Conditions Is PRP Used For?

PRP injections are used most commonly for tendon injuries, ligament sprains, osteoarthritis of major joints, and certain spine-related soft tissue conditions.

In clinical practice, PRP is applied to a range of musculoskeletal conditions. Lateral epicondylitis, commonly called tennis elbow, is among the most studied applications. Knee osteoarthritis, Achilles tendinopathy, rotator cuff tendon injuries, patellar tendinopathy, and plantar fasciitis are also frequently treated with PRP. Some clinicians use PRP for certain disc and facet-related soft tissue pain in the spine, though the evidence base for spinal applications is still developing. The common thread across these conditions is tissue that has limited natural blood supply, which slows the body's own repair process. Tendons and cartilage, in particular, receive relatively little circulation compared to muscle, which is one reason injuries to these structures can linger for months or years. The idea behind PRP is to deliver a concentrated dose of healing signals directly to tissue that otherwise struggles to repair itself. Athletes and active adults, from competitive tennis players to weekend pickleball players and golfers, often seek PRP when an overuse injury or joint problem has not responded adequately to rest, physical therapy, or anti-inflammatory medication.

What the Research Currently Shows

Evidence for PRP is growing but varies by condition. For some applications, like knee osteoarthritis and certain tendinopathies, multiple studies show benefit over placebo or corticosteroid injections. For others, the research is less conclusive.

A 2021 systematic review published in the American Journal of Sports Medicine found that PRP produced greater pain relief and functional improvement than hyaluronic acid injections for knee osteoarthritis in several randomized controlled trials. For lateral epicondylitis, a Cochrane review noted that PRP may outperform corticosteroids for long-term outcomes, though study heterogeneity makes direct comparisons difficult. For rotator cuff and Achilles tendinopathy, results across studies are mixed, with some trials showing clear benefit and others finding modest or no difference compared to saline or physical therapy alone. What the research consistently underscores is that PRP is not a single standardized product. The platelet concentration, the presence or absence of white blood cells, the activation method, and the injection volume all differ between studies and between clinics. This variability makes it challenging to draw sweeping conclusions. The evidence base is evolving, and researchers are working toward standardized protocols that would allow cleaner comparisons. Patients considering PRP should ask their provider which protocol they use and what the current evidence looks like for their specific condition.

Why Patient Selection Matters as Much as the Treatment Itself

PRP is more likely to be appropriate for some patients and some conditions than for others. A careful clinical evaluation is the starting point, not a general interest in the therapy.

Not every patient with joint pain or a tendon injury is a good candidate for PRP. Factors such as the severity of tissue damage, the presence of underlying structural problems, metabolic health, certain medications, and the specific anatomy of the injury all influence whether PRP is a reasonable option. Dr. Sudberg makes this point directly: "Regenerative medicine should not be viewed as a one-size-fits-all solution. The important question is whether a particular regenerative treatment is appropriate for the individual patient and the specific tissue or condition being treated." This is not a cautionary note intended to discourage patients. It is the clinical reality that guides responsible practice. A patient with mild to moderate knee osteoarthritis and no serious structural instability is a very different candidate from one with advanced bone-on-bone deterioration. Similarly, a tendon with partial tearing may respond differently than one that has fully ruptured. James, a patient from New York, described his experience with Dr. Sudberg's care this way: "I can't put into words how immensely grateful I am for Dr. Sudberg's medical care." While every patient's experience is individual and results are not guaranteed, responses like James's reflect what a careful, diagnosis-first approach can mean to someone who has been living with persistent pain. For anyone considering PRP or other regenerative options, the evaluation process is as important as the treatment itself.

What to Expect Before, During, and After a PRP Injection

The procedure itself is relatively brief, but preparation and the recovery period that follows are important parts of the process.

Before a PRP injection, your clinician will review your medications. Nonsteroidal anti-inflammatory drugs, commonly called NSAIDs, such as ibuprofen or naproxen, are typically paused in the days before the procedure because they may blunt the platelet response. Certain blood thinners may also require temporary adjustment under medical supervision. On the day of the procedure, the blood draw and centrifugation take place in the clinic. The injection itself is often performed under ultrasound guidance so the clinician can confirm accurate placement. Mild soreness or swelling at the injection site in the first few days is common and expected. This is part of the tissue response. Strenuous activity is usually restricted for a short period, and your provider will give you a specific timeline based on the treated area and your condition. PRP is not an immediate fix. The tissue remodeling process it aims to support takes weeks to months. Many patients begin to notice a change in symptoms between four and twelve weeks after injection, though this varies considerably. Some treatment plans involve more than one injection. Following through on any recommended physical therapy or rehabilitation alongside PRP is often an important part of the overall plan. If you are curious about whether PRP or another form of regenerative care might be appropriate for your situation, a consultation with a qualified clinician is the right place to start. You can learn more about the broader range of regenerative medicine options available at Spine and Sports Rehab NY.

Frequently asked questions

How long does a PRP injection take?

The full process, including blood draw, centrifugation, and the injection itself, typically takes under an hour in a clinic setting.

Is PRP therapy painful?

Some patients experience mild discomfort during the injection and soreness at the site for a few days afterward. This is a normal part of the tissue response. Your clinician can discuss ways to manage temporary discomfort.

How many PRP injections are needed?

The number varies by condition, severity, and individual response. Some patients receive a single injection while others follow a protocol of two or three. Your clinician will outline a plan based on your specific situation.

Is PRP covered by insurance?

PRP injections are often not covered by standard health insurance in the United States because many payers classify them as experimental or investigational for musculoskeletal conditions. It is worth confirming coverage with your provider and insurer before proceeding.