Platelet-rich plasma, often called PRP, is a common topic in arthritis, tendon pain, and sports medicine conversations.
It is appealing because it uses a sample of your own blood and concentrates platelets that contain growth factors and signaling proteins involved in healing. But PRP is not magic, and the results are not the same for every condition or every person.
This article explains what PRP is, how it may help with knee arthritis or tendon pain, what the limitations are, and how to think about it as part of a broader treatment plan.
Quick Answer
PRP is made by drawing a small amount of blood, processing it to concentrate platelets, and injecting the platelet-rich portion into a joint, tendon, or injured tissue. It may help some people with mild to moderate knee osteoarthritis or chronic tendon problems, but results vary.
PRP should not be treated as a stand-alone cure. It works best when the diagnosis is clear and the injection is paired with strength, mobility, load management, and a realistic plan for returning to activity.
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Key Takeaways
- PRP uses your own blood to create a platelet-concentrated injection.
- PRP may help some people with mild to moderate knee osteoarthritis or chronic tendon pain, but results are inconsistent.
- Cost, lack of insurance coverage, and lack of standardization are major limitations.
- PRP is less likely to be useful if the main issue is severe joint degeneration, major instability, or advanced arthritis.
- The injection should be paired with rehab and load management, not used as a replacement for them.
What Is PRP Therapy?
PRP is created by taking a sample of your blood and processing it to isolate a platelet-rich portion of the plasma.
Platelets contain growth factors and proteins involved in tissue signaling, inflammation, and repair. The idea is that concentrating those platelets and injecting them into a painful joint or tendon may help reduce symptoms or support tissue healing.
Different PRP systems can produce different products. Some contain more white blood cells, some contain fewer, and platelet concentration can vary. That matters because not all PRP injections are exactly the same.
How PRP May Help With Joint Pain
PRP has been studied for several conditions, including knee osteoarthritis, tendon pain, and soft tissue injuries.
1. Tendon Pain
PRP has been used for chronic tendon problems such as tennis elbow, plantar fasciitis, patellar tendinopathy, and Achilles tendinopathy.
For chronic tendon pain, the goal is not simply to reduce pain for a few days. The goal is to help the tissue environment while you gradually rebuild the tendon’s ability to tolerate load.
2. Knee Osteoarthritis
PRP is often discussed for mild to moderate knee osteoarthritis. Some studies suggest it may reduce pain and improve function for selected people, but results vary and guideline recommendations are not uniform.
The AAOS knee osteoarthritis guideline states that PRP may reduce pain and improve function in patients with symptomatic knee osteoarthritis, while also noting limitations in the strength of the recommendation. AAOS knee osteoarthritis guideline
Other guidelines are more cautious. The ACR/Arthritis Foundation guideline strongly recommends against PRP for knee and hip osteoarthritis because of concerns about heterogeneity and lack of standardization. ACR/Arthritis Foundation osteoarthritis guideline
That disagreement is important. PRP is promising, but it is not settled science for every arthritis case.
3. Soft Tissue Injuries
PRP is also used for some ligament sprains, muscle injuries, and other soft tissue conditions. The quality of evidence depends heavily on the specific injury, protocol, and outcome being measured.
Potential Benefits of PRP
- Uses your own blood: PRP is made from your own sample rather than a synthetic medication.
- Minimally invasive: It is usually performed as an injection rather than a surgery.
- May reduce pain: Some people experience meaningful symptom improvement.
- May support rehab: If pain improves, it may create a better window for strengthening and load progression.
Limitations and Risks
- Cost: PRP can be expensive and may not be covered by insurance.
- Inconsistent results: Some people improve a lot, while others notice little change.
- Lack of standardization: PRP preparation methods differ, which makes results harder to compare.
- Delayed response: PRP is not usually an immediate pain-relief injection like cortisone can be.
- Medication timing: Some clinicians recommend avoiding NSAIDs around the procedure because they may interfere with platelet activity.
- Post-injection soreness: Temporary soreness can happen after the injection.
Who Might Benefit Most?
PRP may be more reasonable to discuss when the problem is mild to moderate, the person is motivated to pair it with rehab, and other basic conservative treatments have not been enough.
Possible candidates may include:
- People with mild to moderate knee osteoarthritis who want to delay surgery.
- People with chronic tendon pain that has not responded to a well-dosed rehab plan.
- Active people trying to return to sport or fitness without jumping straight to surgery.
- People who understand the cost and uncertainty of results.
Who May Not Be a Great Fit?
PRP is less likely to be the main answer when the knee is severely arthritic, very unstable, mechanically blocked, or already clearly headed toward joint replacement.
It may also be a poor fit if the person expects it to replace exercise, strength training, weight management, or activity modification.
How PRP Should Fit Into a Broader Plan
The injection is only one piece. The more important question is what you do with the window afterward.
A better plan usually includes:
- Clarifying the diagnosis.
- Reducing unnecessary flare-ups.
- Building strength gradually.
- Improving joint motion and load tolerance.
- Using low-impact conditioning to maintain fitness.
- Progressing activity based on response.
Common Mistakes
- Treating PRP like a guaranteed fix.
- Paying for PRP before doing a real trial of exercise, strength, and load management.
- Using PRP for severe arthritis while expecting it to rebuild the joint.
- Not asking what type of PRP is being used or how many injections are recommended.
- Resting too long afterward and missing the chance to rebuild capacity.
Related Learning
Want to keep learning about knee arthritis and knee replacement decisions? These articles may help:
FAQ
What is PRP?
PRP stands for platelet-rich plasma. It is made from your own blood and injected into a joint, tendon, or tissue with the goal of supporting healing or reducing symptoms.
Does PRP work for knee arthritis?
It may help some people with mild to moderate knee osteoarthritis, but results vary and guidelines disagree. It is not a guaranteed treatment.
Is PRP better than cortisone?
Not always. Cortisone may provide faster short-term relief, while PRP is often discussed as a longer-term biologic option. The better choice depends on the diagnosis, severity, goals, cost, and response to prior care.
Is PRP covered by insurance?
Often it is not covered, though coverage varies. Cost should be part of the decision.
Should I do rehab after PRP?
Yes. PRP should usually be paired with a progressive rehab plan so any symptom improvement is used to build strength, motion, and activity tolerance.
