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PRP for Knee Arthritis in Naples & Marco Island
If you have been told you'll eventually need a knee replacement, that your pain is "wear and tear," or that you've reached the end of what physical therapy and over-the-counter medications can offer — there are now real, evidence-supported alternatives. Platelet-rich plasma (PRP) is one of them. At Timeless Interventional of Naples, it has become a meaningful option for the right patients with knee osteoarthritis.
This page walks through what PRP actually is, what the evidence shows, who is a good candidate, what to expect, and how we approach the procedure differently than most practices in the area.
BASICS
What PRP actually is
PRP is a concentrated preparation of platelets — small cells in your own blood that release dozens of growth factors involved in tissue repair and inflammation modulation. By drawing a small amount of your blood, processing it in a specialized centrifuge to isolate and concentrate the platelets, and injecting that solution directly into the damaged knee joint, we deliver a targeted dose of your body's natural healing signals exactly where they're needed.
It is not stem cells. It is not synthetic. It is not a drug. It is your own biology, concentrated and delivered precisely.
MECHANISM
Why PRP for the knee?
The knee is one of the best-studied targets for PRP. Multiple randomized controlled trials and meta-analyses now support its use for knee osteoarthritis, with the strongest evidence in mild-to-moderate disease (Kellgren-Lawrence grades 1-3). PRP works through several mechanisms — modulating joint inflammation, supporting the cartilage environment, and slowing degenerative cascades — that simply aren't addressed by steroid injections or anti-inflammatory medications.
For many patients, PRP has been shown to outperform cortisone and hyaluronic acid (gel injections) on both pain reduction and functional improvement, with benefits often lasting six to twelve months or longer.
EVIDENCE
What the evidence honestly shows
In well-conducted studies, meaningful response rates typically fall in the 60-70% range. The majority of patients experience meaningful pain reduction and improved function, with benefits typically peaking at three to six months and gradually waning thereafter. Many patients return for a second series after one to two years.
It is not a guarantee. It is not a cure for advanced bone-on-bone disease. The patients who do best are those with realistic expectations, mild-to-moderate disease, and a willingness to follow post-procedure guidance. We discuss all of this in detail during your consultation — including whether PRP is genuinely the right option for you.
CANDIDACY
Who is a good candidate?
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Grade 1-3 knee osteoarthritis on imaging (mild to moderate)
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Persistent knee pain affecting quality of life
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Not yet a candidate for, or not ready for, joint replacement
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Looking for an alternative to repeat cortisone injections
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Active and motivated to follow post-procedure activity recommendations
When PRP may not be the right option​
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PRP isn't appropriate for everyone — advanced bone-on-bone arthritis, active joint infection, certain bleeding disorders, and a few other conditions make PRP less likely to help or potentially unsafe. We'll work through this carefully during your consultation, and we'll tell you honestly if PRP isn't your best option.
These distinctions are part of your consultation. If PRP isn't the right fit for you, we'll tell you, and help you understand what might be.
PROCEDURE​
What to expect during the procedure
1. Blood draw — typically 60ml, like a standard blood test
2. Centrifuge processing — about 15-20 minutes, performed in our office, using the EmCyte PurePRP double-spin system
3. Sterile preparation of the knee
4. Ultrasound-guided injection — confirming precise placement into the joint space, not surrounding tissue
5. Brief observation period, then home
6. Total visit time: approximately 45-60 minutes
RECOVERY
Recovery timeline
First 24-72 hours
Mild flare of pain or stiffness is normal — and is part of the expected inflammatory response that signals healing has begun. Ice and rest are appropriate. Over-the-counter NSAIDs are typically avoided in this window because they may interfere with the healing cascade.​
Week 1
Take it easy. Walking is fine. No high-impact activity, no heavy lifting.
Weeks 2-4
Gradual return to normal activity.
Months 3-6
Peak benefit.
Many patients require a series of 2-3 injections spaced one to four weeks apart for optimal results.
COMPARISON
PRP vs. cortisone — an honest comparison
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Cortisone provides faster relief, but the duration is short (weeks to a few months). Repeated cortisone exposure damages cartilage over time, which becomes a significant concern in a knee already showing wear.
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PRP has a slower onset (weeks), but the benefit lasts longer (six to twelve months or more) and supports tissue health rather than degrading it.
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For early-to-moderate osteoarthritis, the evidence increasingly favors PRP over repeat cortisone.
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We do not consider PRP a replacement for cortisone in every scenario — there are still patients for whom cortisone is appropriate. But for the right patient, PRP is a more durable and biologically constructive choice.
PRECISION
Why image guidance matters
A significant percentage of "blind" knee injections — those performed without ultrasound or fluoroscopy — do not actually enter the joint space. Studies have shown that anatomic accuracy can be as low as 70% in some hands. When the injection misses the joint, the medication or PRP is deposited into surrounding tissue and may not work as intended.
We perform every PRP injection under ultrasound guidance. This confirms the exact needle position, ensures the PRP is delivered into the joint, and substantially improves the likelihood of a meaningful clinical response.
QUALITY
Why the quality of PRP preparation matters
Not all PRP is the same. The concentration of platelets, the purity of the preparation, and the consistency from case to case all influence clinical outcomes. Inexpensive single-spin kits produce a PRP solution that is only modestly more concentrated than baseline blood — and studies suggest these may underperform higher-quality systems.
At Timeless Interventional of Naples, we use the EmCyte PurePRP double-spin 60ml system, which produces high-concentration PRP (multiple times baseline) with consistent platelet recovery. This is the same category of system used in many of the published positive clinical trials.
OUR PHILOSOPHY
Our approach
We do PRP differently than most practices in our area:
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45-60 minute initial evaluation — not the 15-minute appointment you may have experienced elsewhere
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Ultrasound-guided injection every time, without exception
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Honest candidacy assessment — including a clear conversation about whether PRP is the right option for you, or whether you'd be better served by another approach
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Outcome tracking with validated tools, so we know exactly how you're progressing
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Coordinated care with the rest of your treatment plan, including hormone optimization where relevant (hormonal changes meaningfully affect joint health, especially in perimenopausal and menopausal women)
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Dr. Chaturani Ranasinghe is a double board-certified anesthesiologist and interventional pain physician. She earned her medical degree at the University of Miami and completed her pain medicine fellowship at NYU Medical Center, where she later served on the faculty. She has been recognized by Naples Illustrated as a 2026 Top Doctor in Pain Management.