BMAC Stem Cell Therapy for Knee Pain and Osteoarthritis in Miami
Knee pain from osteoarthritis is one of the most common and debilitating musculoskeletal conditions in adults β and one of the most undertreated at its biological source. Whether you have early cartilage loss, moderate joint space narrowing, or advanced bone-on-bone arthritis, bone marrow aspirate concentrate (BMAC) stem cell therapy offers a regenerative approach that targets the joint at the cellular level β using your own biology to support tissue repair and modify the degenerative process driving your pain.
Dr. William Bonner is a credentialed Regenexx network provider in Miami β part of the world’s most advanced regenerative orthopedics organization. Every BMAC procedure is performed under image guidance using Regenexx proprietary processing protocols.
What Makes BMAC Different for Knee Osteoarthritis?
Conventional knee OA treatments address symptoms without altering the biology driving cartilage loss. BMAC is a regenerative medicine tool that targets the joint at the cellular level by delivering three key components that no standard treatment can provide:
- Mesenchymal stem cells (MSCs) β progenitor cells that support cartilage matrix maintenance, modulate the inflammatory environment in the arthritic joint, and may differentiate into chondrocyte-like cells
- Concentrated platelets and growth factors β including PDGF, TGF-Ξ², and IGF-1, which drive tissue healing and support cartilage cell survival
- Anti-inflammatory cytokines β which help shift the joint from a degenerative to a healing biological state
Can BMAC Help with Bone-on-Bone Knee Arthritis?
This is the question Dr. Bonner hears most often β and the honest answer is: it depends on the extent of degeneration, but many patients with significant joint space narrowing, including bone-on-bone changes, have achieved meaningful improvement with BMAC.
BMAC is not a cure for end-stage arthritis, and patients with complete joint destruction and severe deformity are typically not good candidates. But the threshold for ‘too advanced’ is often set earlier than it should be. Dr. Bonner reviews each patient’s imaging carefully and gives an honest, individualized assessment β not a blanket response.
If your imaging shows significant narrowing but not complete joint destruction, BMAC is worth a serious conversation.
BMAC vs. Other Knee Osteoarthritis Treatments
| Treatment | Effect on Joint Biology | Duration of Benefit | Best For |
| Physical Therapy | Supportive; strengthens surrounding musculature | Long-term with compliance | All OA stages |
| Corticosteroid Injection | Suppresses inflammation temporarily; may accelerate cartilage loss with repeated use | Weeks to months | Acute flare management |
| Hyaluronic Acid | Lubricates joint | 3β6 months | Mild-moderate OA |
| PRP Therapy | Growth factors reduce inflammation and support healing | Months to 1+ year | Mild to moderate OA |
| BMAC Stem Cell Therapy | MSCs + growth factors support repair and modulate joint biology | 1β3 years in many patients | Moderate to advanced OA; bone-on-bone |
| Knee Replacement | Replaces the damaged joint entirely | Permanent | End-stage OA only |
BMAC vs. PRP for Knee Pain
Both PRP and BMAC are autologous treatments using your own biology. PRP is derived from a blood draw and is an excellent first-line regenerative option for mild to moderate knee OA. BMAC adds mesenchymal stem cells β making it the preferred option for more advanced cartilage loss, bone marrow lesions, or cases where PRP has not provided sufficient improvement. Often, Dr. Bonner uses both together for a more comprehensive regenerative effect.
Why a Regenexx Provider Makes a Difference
Many clinics in Miami advertise ‘stem cell therapy’ using amniotic or umbilical cord products that independent research has shown to contain no viable living stem cells. As a credentialed Regenexx network provider, Dr. Bonner uses your own living bone marrow stem cells β harvested and processed the same day β under strict evidence-based protocols backed by the largest regenerative orthopedics outcome registry in the world. Regenexx is the only organization with this combination of proprietary lab processing, published clinical research, and rigorous provider credentialing.
Who Is a Good Candidate?
- Moderate to advanced knee osteoarthritis confirmed on X-ray or MRI
- Significant cartilage loss, bone marrow lesions, or bone-on-bone changes
- Inadequate lasting relief from PRP, cortisone, or hyaluronic acid
- Desire to avoid or significantly delay total knee replacement
- Active adults seeking to maintain function and quality of life
- Patients told ‘you’re not bad enough for surgery yet’ who want a meaningful non-surgical option
Intraosseous BMAC Injection β Targeting the Bone, Not Just the Joint
Most regenerative medicine clinics offering stem cell therapy for knee osteoarthritis perform a single intraarticular injection β delivering BMAC into the joint space. This is appropriate for cartilage and synovial pathology, but it misses a critical component of knee OA that drives significant pain in many patients: the subchondral bone.
The pioneering work of Dr. Philippe Hernigou at the UniversitΓ© Paris Est CrΓ©teil has demonstrated that subchondral bone pathology β including bone marrow lesions, microfractures, and osteonecrosis-like changes within the tibial plateau and femoral condyles β is a primary driver of pain and disease progression in knee osteoarthritis that is not adequately addressed by intraarticular injection alone. Dr. Hernigou’s research on intraosseous injection of bone marrow concentrate has shown that delivering stem cells directly into the subchondral bone β rather than solely into the joint space β produces superior outcomes for patients with significant bone marrow involvement.
At our Miami clinic, Dr. Bonner is trained in intraosseous BMAC injection technique as part of the Regenexx network’s advanced procedural protocols. For patients with confirmed bone marrow lesions on MRI β visible as areas of abnormal signal within the tibial plateau or femoral condyle β Dr. Bonner can combine intraarticular BMAC with a targeted intraosseous injection directly into the lesion under fluoroscopic guidance.
This dual approach addresses two distinct pathological targets in a single treatment session:
- Intraarticular BMAC β delivers mesenchymal stem cells and growth factors into the joint space to address cartilage loss, synovial inflammation, and the intra-articular environment
- Intraosseous BMAC β delivers stem cells directly into the subchondral bone lesion to support bone marrow repair, reduce intraosseous pressure, and address the bone-level pathology that intraarticular injection cannot reach
This is not a standard offering at most regenerative medicine practices. It requires specialized needle technique, fluoroscopic guidance, and specific training in intraosseous access β all of which Dr. Bonner has as part of his Regenexx credentialing and advanced procedural training.
For patients whose MRI shows significant bone marrow lesions alongside cartilage loss β a common pattern in moderate to advanced knee OA β this combined approach represents the most comprehensive biological treatment currently available outside of surgery.
What to Expect
The procedure is performed in a single visit at our Miami clinic. Bone marrow is aspirated from the posterior iliac crest under local anesthetic and ultrasound and/or fluoroscopic guidance, processed in-office using Regenexx concentration protocols, then injected into the knee under imaging guidance. Total procedure time including processing is approximately 2.5 to 3.5 hours.
Most patients resume light daily activities within 1β3 days. Improvement develops gradually over 6β12 weeks, with continued benefit over 3β6 months.
Frequently Asked Questions
Can BMAC help with bone-on-bone knee arthritis?
Many patients with significant joint space narrowing β including near bone-on-bone changes β have experienced meaningful improvement with BMAC. Results depend on the extent of degeneration, patient factors, and commitment to rehabilitation. Dr. Bonner will give you an honest, individualized assessment based on your imaging.
How is this different from the stem cell clinics I see advertised in Miami?
Many clinics advertising ‘stem cell therapy’ use amniotic or umbilical cord products that independent research has shown to contain no viable living stem cells. BMAC uses your own living bone marrow cells, harvested and concentrated the same day. As a Regenexx provider, Dr. Bonner follows strict evidence-based protocols tracked in the largest regenerative orthopedics registry in the world.
How long does relief from BMAC last for knee osteoarthritis?
Many patients experience meaningful improvement for several years. Results vary based on disease severity, age, and activity level. The procedure can be repeated as needed.
Does insurance cover BMAC stem cell therapy for knee pain?
BMAC is not currently covered by most health insurance. Our team will provide detailed pricing at your consultation.
Can I combine BMAC with PRP for knee osteoarthritis?
Yes. In many cases Dr. Bonner uses PRP and BMAC together β each targeting different aspects of the joint environment for a more comprehensive regenerative effect.
Schedule a Consultation
If you are dealing with knee pain or knee osteoarthritis – including bone-on-bone osteoarthritis – and want to explore whether BMAC therapy is right for you, we are here to help.
Contact our Miami clinic to schedule an appointment with Dr. Bonner, or book online through ZocDoc for available appointment times (if you do not see availability, please reach out to us directly at 786-522-4959).