Knee arthritis is one of the most common causes of knee pain and reduced mobility in adults. If you’re experiencing stiffness, swelling, or discomfort that limits your ability to stay active, you may be exploring treatment options beyond medications, cortisone injections, or surgery.
One treatment that has received growing attention is Platelet-Rich Plasma (PRP) therapy. While research continues to evolve, many patients are interested in whether PRP may help manage symptoms associated with knee osteoarthritis.
What is Knee Osteoarthritis?
Knee osteoarthritis (OA) is a degenerative joint condition that occurs when the cartilage within the knee gradually wears down over time. Common symptoms include:
- Knee pain
- Joint stiffness
- Swelling
- Reduced range of motion
- Difficulty with walking, exercising, or daily activities
Risk factors may include age, previous injuries, excess body weight, repetitive joint stress, and genetics.
What Is PRP Therapy?
Platelet-Rich Plasma (PRP) is prepared from a patient’s own blood. A blood sample is collected and processed to concentrate platelets, which contain naturally occurring growth factors and other bioactive proteins.
The PRP is then injected into the affected area using sterile technique. In many cases, ultrasound guidance is used to help ensure accurate placement.
How Is PRP Thought to Work?
Researchers believe PRP may influence biological processes involved in inflammation and tissue signaling. Platelets contain growth factors that play a role in the body’s natural healing response.
While the exact mechanisms are still being studied, PRP has been investigated for its potential to:
- Support the body’s natural healing processes
- Influence inflammatory pathways
- Promote a healthier joint environment
It is important to note that PRP is not FDA-approved for the treatment of knee osteoarthritis, and individual results can vary.
What Does the Research Show?
A growing number of clinical studies have evaluated PRP for knee osteoarthritis.
1) 2025 Meta-Analysis: PRP Injections for the Treatment of Knee Osteoarthritis
Key Findings
The authors found that:
- Patients receiving PRP generally reported greater improvements in pain and function compared with control treatments.
- Benefits were observed across multiple follow-up time points.
- PRP demonstrated statistically significant improvements in several commonly used osteoarthritis outcome measures.
- The findings supported PRP as a treatment option for symptomatic knee osteoarthritis.
Citation: https://pubmed.ncbi.nlm.nih.gov/39751394/
2) 2021 Meta-Analysis: PRP Injections for the Treatment of Knee Osteoarthritis
Key Findings
The researchers found that:
- Patients who received PRP experienced greater improvements in pain and function than those who received hyaluronic acid injections.
- These improvements were observed at several follow-up intervals, including longer-term follow-up.
- PRP was associated with better scores on commonly used osteoarthritis assessment tools.
- Both treatments were generally well tolerated, with no major differences in adverse events reported between groups.
Citation: https://pubmed.ncbi.nlm.nih.gov/32551947/
PRP Has Been Associated with Improvements in Pain and Function
Several randomized controlled trials and systematic reviews have reported that p