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BMAC vs. PRP for Knee Arthritis: What's the Difference?

· Medically reviewed by

Paul Tortland, DO

on

August 20, 2026

BMAC & MFAT: Cellular Orthobiologics

RCT-Backed

What You Need to Know

PRP uses concentrated platelets from a patient's blood, while BMAC uses cells and growth factors from bone marrow. Both calm joint inflammation rather than regrowing cartilage; a 2021 randomized trial found BMAC outperformed PRP and hyaluronic acid on several outcome measures at 12 months in knee osteoarthritis.

What Are Cellular Biologics and Why Do the Terms Get Confusing?

Patients researching regenerative treatment options often run into a wall of near-identical-sounding terms — PRP, BMAC, stem cells, orthobiologics — without a clear sense of what actually separates one from another. Understanding the difference matters, because these treatments are not interchangeable, and choosing the right one affects both cost and outcome.

How Does PRP Work?

Platelet-rich plasma (PRP) comes from a patient's own blood. A small sample is drawn and spun in a centrifuge to concentrate the platelets, which carry growth factors that help calm inflammation and support tissue repair. It's the most studied and most widely used orthobiologic treatment, and for good reason: it's simple to prepare, well-tolerated, and has a large and growing evidence base spanning joints, tendons, and ligaments.

How Does BMAC Work, and How Is It Different from PRP?

Bone marrow aspirate concentrate (BMAC) starts from a different material entirely. It's drawn from a patient's own bone marrow — typically the pelvis — and concentrated to isolate a mix of cells and growth factors, including mesenchymal stem cells. BMAC is a more involved procedure than PRP, generally requires more specialized equipment and expertise to harvest and process correctly, and is often reserved for more advanced or stubborn cases where a simpler PRP injection is less likely to be sufficient.

Neither treatment is a stem cell that "turns into new cartilage," despite how they're sometimes marketed. Their primary role is modulating the local inflammatory and healing environment, not manufacturing new tissue from scratch — an important distinction for setting realistic expectations.

What Does the Research Show When BMAC and PRP Are Compared Directly?

One of the more informative studies is a randomized controlled trial comparing BMAC, PRP, and hyaluronic acid injections in patients with knee osteoarthritis, following 175 patients for 12 months. All three treatments were safe, with no serious side effects reported. BMAC showed statistically better outcomes than the other two on multiple pain and function scores at 12 months; PRP outperformed hyaluronic acid numerically, though not to a statistically significant degree.

Should I Choose BMAC or PRP?

In practical terms: BMAC may offer an edge for appropriately selected patients, particularly those with more advanced arthritis, but it's also a more involved and typically more expensive procedure. PRP remains an excellent, well-supported first step for many patients, especially those with mild to moderate disease. Choosing between them isn't about which sounds more advanced — it's about matching the right tool to the joint, the diagnosis, and the patient's goals, which is a conversation best had with imaging and a full history in hand, not a menu of injections.

Are PRP and BMAC the Same as Stem Cell Therapy?

They're related but not identical. BMAC contains a mix of cells and growth factors, including mesenchymal stem cells, while PRP is purely concentrated platelets from blood, with no stem cell component at all. Neither is a purified, lab-expanded stem cell product, which distinguishes them from some of the more aggressively marketed "stem cell" therapies advertised outside the realm of same-day, same-patient orthobiologic procedures.

Reference

According to PubMed: Dulic O, Rasovic P, Lalic I, Kecojevic V, Gavrilovic G, Abazovic D, Maric D, Miskulin M, Bumbasirevic M. Bone Marrow Aspirate Concentrate versus Platelet Rich Plasma or Hyaluronic Acid for the Treatment of Knee Osteoarthritis. Medicina (Kaunas). 2021. DOI: 10.3390/medicina57111193

Frequently Asked Questions

Is BMAC better than PRP?

Not universally. BMAC showed better outcomes than PRP in some studies, particularly for more advanced arthritis, but it's also a more involved and typically more expensive procedure. PRP remains an excellent first option for many patients with mild to moderate disease.

Does BMAC hurt more than PRP?

BMAC requires drawing bone marrow, typically from the pelvis, which involves a somewhat more involved collection process than a simple blood draw for PRP, though both are done with local anesthesia and are generally well tolerated.

Are BMAC and PRP the same as stem cell therapy?

They're related but not identical. BMAC contains a mix of cells and growth factors, including mesenchymal stem cells, while PRP is purely concentrated platelets from blood. Neither is a purified stem cell product on its own.

How do I know whether I need PRP or BMAC?

This depends on your diagnosis, the severity of your condition, and your treatment goals — a conversation best had with a full history and imaging, not a generic recommendation.

BMAC vs. PRP for Knee Arthritis: What's the Difference?

PRP uses concentrated platelets from a patient's blood, while BMAC uses cells and growth factors from bone marrow. Both calm joint inflammation rather than regrowing cartilage; a 2021 randomized trial found BMAC outperformed PRP and hyaluronic acid on several outcome measures at 12 months in knee osteoarthritis.

August 15, 2026

August 20, 2026

Paul Tortland, DO

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BMAC vs. PRP for Knee Arthritis: Which Is Better? | Dr. Paul Tortland

BMAC and PRP both treat knee arthritis without surgery, but they differ in source, procedure, evidence, and typical patient selection. Here's what to know.