What BMAC Contains and How It Works
Bone marrow is one of the richest sources of regenerative cells in the adult body. BMAC concentrates these cells and factors from a bone marrow aspirate drawn from the posterior iliac crest (the back of the hip bone):
Mesenchymal Stem Cells (MSCs)
MSCs can differentiate into chondrocyte-like cells (for disc and cartilage repair), osteoblasts (for bone healing), and fibroblasts (for ligament and tendon repair). Beyond differentiation, MSCs secrete a powerful array of trophic factors that modulate inflammation, promote angiogenesis, and recruit additional repair cells to the injury site. This paracrine signaling may be as important as the cells themselves.
Hematopoietic Progenitors and Growth Factors
Hematopoietic progenitors contribute to the immune-modulatory environment. Growth factors (PDGF, TGF-B, BMP, VEGF) are present in even higher concentrations than PRP. Anti-inflammatory cytokines (IL-1Ra, IL-10) shift the tissue environment from chronic destructive inflammation to controlled reparative signaling.
Cellular capability beyond growth factor delivery. When delivered to a degenerating disc, BMAC provides what the disc cannot access on its own: cells capable of producing new extracellular matrix, growth factors that stimulate resident cell activity, and anti-inflammatory signals that break the degenerative cycle. PRP provides growth factors; BMAC adds the cellular machinery that responds to those signals.
Spine Conditions Treated with BMAC
- Advanced Degenerative Disc Disease - When PRP alone is insufficient, BMAC delivers MSCs capable of producing proteoglycans and type II collagen to support disc integrity.
- Spinal Stenosis - BMAC addresses the degenerative processes-disc degeneration, facet arthropathy-driving canal narrowing.
- Advanced Facet Arthropathy - BMAC provides chondrocyte-lineage cells for joint cartilage support.
- Neuropathic Pain - MSC-derived neurotrophic factors support nerve healing and reduce neuroinflammation.
- Pars Fractures - Osteoblast-lineage cells from BMAC promote bone healing at non-union fracture sites.
The BMAC Procedure
The procedure begins with bone marrow aspiration from the posterior iliac crest. We thoroughly numb the aspiration site with local anesthetic-most patients describe the sensation as deep pressure rather than pain. The aspirated marrow is processed in a specialized centrifuge to concentrate the regenerative cells and growth factors into a small volume of BMAC.
The concentrated BMAC is then injected under image guidance (fluoroscopy or ultrasound) directly into the target tissue-the degenerating disc, the arthritic joint, or the perineural space. Precision of delivery is critical: BMAC is too valuable to deposit imprecisely.
The entire procedure takes 60-90 minutes. The aspiration site may be sore for several days. Activity modification for 2-4 weeks after treatment allows the delivered cells to engraft and begin their reparative work.
BMAC vs. PRP: When to Use Each
PRP and BMAC are not competing treatments-they are different tools for different situations. PRP is appropriate for mild to moderate degeneration, annular tears, ligamentous injuries, and joint inflammation. It provides concentrated growth factors but not regenerative cells. BMAC is appropriate for advanced degeneration, significant cartilage loss, bone healing, and conditions where PRP has produced incomplete results. It provides both cells and growth factors.
In many patients, we use both: BMAC for the most significantly affected structures and PRP for secondary treatment areas. The integrated approach addresses the entire degenerative segment rather than a single tissue type.