Bone Marrow Aspirate Concentrate (BMAC)
A patient guide — what BMAC is, how it's prepared from your own bone marrow, which conditions it may suit, and its honest limits.
Bone marrow aspirate concentrate (BMAC) is an autologous biologic treatment prepared using your own bone marrow. During the procedure, a small amount of bone marrow is collected — most commonly from the back of the pelvis (posterior iliac crest) — then processed to concentrate naturally occurring cells and biologic components before being injected into the targeted area under ultrasound and/or fluoroscopic guidance. Because it’s prepared from your own bone marrow during the same procedure, BMAC is an autologous treatment.
How BMAC works
Although research is ongoing, BMAC is believed to work by delivering a concentrated mixture of biologically active cells and signaling proteins to an area of injury or degeneration. Rather than replacing damaged tissue, it’s intended to support the body’s natural biologic response. Individual outcomes vary depending on the diagnosis, severity of disease, overall health, rehabilitation, and many other factors.
Conditions that may be appropriate
BMAC may be considered in selected patients after a comprehensive evaluation — recommendations depend on your specific diagnosis and the available evidence.
The procedure & timeline
A typical procedure involves reviewing the treatment plan and informed consent, local anesthesia (and sedation when appropriate), bone marrow aspiration from the pelvis, processing the aspirate to create the concentrate, an ultrasound- or image-guided injection into the targeted tissue, and post-procedure monitoring before discharge. Local anesthetic reduces discomfort during aspiration; temporary soreness at the aspiration and injection sites for several days is common.
Recovery & potential risks
BMAC is one of the most sophisticated biologic procedures in musculoskeletal medicine — but sophistication doesn’t make it the right treatment for everyone. In many cases PRP, rehabilitation, or another treatment is more appropriate. The procedure is only one part of the plan; long-term outcomes also depend on rehabilitation, progressive loading, nutrition, sleep, overall health, and realistic expectations.
Common misconceptions
It's more accurate to think of BMAC as a concentrated bone marrow aspirate — it contains many cell types, including a small number of progenitor cells, not a purified stem cell product.
Current research hasn't established that BMAC reliably regenerates cartilage or reverses arthritis. The goal is to improve symptoms and function in selected patients.
They're different tools and aren't interchangeable. Depending on the diagnosis, one may fit better than the other — and some conditions benefit from neither.
Recovery depends on many factors beyond the procedure — rehabilitation, activity modification, general health, and the underlying diagnosis.
Questions worth asking
Why are you recommending BMAC instead of another treatment?
What alternatives should I consider?
What does the current evidence suggest for my condition?
What should I expect during recovery?
What role will rehabilitation play afterward?
How will we measure my progress over time?