Bone marrow aspirate concentrate (BMAC) is a regenerative therapy derived from a patient’s own bone marrow, which is collected and processed to concentrate the body’s natural healing agents, including stem cells.
Procedures using BMAC injectate may be recommended for knee injuries or degenerative conditions by physicians in the licensed Regenexx network. This non-surgical option may support the natural repair processes of the knee, potentially reducing pain and improving joint function. By harnessing the body’s own healing ability, this approach may reduce reliance on medications and the need for more invasive interventions.
Are You A Potential Candidate For A BMAC Procedure?
Physicians in the licensed Regenexx network evaluate several factors to determine if a person may be a suitable candidate for a procedure using BMAC injectate:
- Type of Knee Condition: BMAC injectate may be considered for degenerative knee conditions, such as osteoarthritis, or injuries involving cartilage, meniscus, or ligaments. In these cases, BMAC injectate may provide concentrated healing agents to support the body’s natural repair processes.
- Response to Other Treatments: Individuals considered are often those whose pain or symptoms have not subsided with rest, physical therapy, medications, or after attempting other typical conservative measures.
- Severity of Symptoms: Procedures using BMAC injectate may be considered for individuals who have moderate symptoms that affect daily activities, but whose condition does not yet necessitate surgery.
- Overall Joint Health: The presence of reasonable joint space and healthy surrounding tissues may improve the likelihood of a positive response by providing a better environment for tissue repair.
- General Health Status: Good overall health may support better tissue healing. Conversely, uncontrolled conditions such as diabetes or immune disorders may limit the effectiveness of the procedure.
- Imaging Findings: MRI or X-rays help the physician evaluate structural damage to determine suitability for treatment with BMAC injectate rather than surgical repair.
A thorough assessment by the physician helps confirm that the procedure is recommended only when it may support the body’s natural repair process and suit the patient’s individual needs.
Knee Conditions That May Respond To BMAC Injectate
Procedures using BMAC injectate may be recommended for a range of knee problems where tissue healing or repair is needed. These include:
- Knee Osteoarthritis: BMAC injectate may help support cartilage health and reduce inflammation in degenerative joint conditions, offering a non-surgical option for individuals with moderate osteoarthritis.
- Meniscus Tears: The healing agents in BMAC may assist the body’s natural healing response for certain types of meniscus injuries, particularly when the tear is in an area with a blood supply. These types of tears may represent the majority of meniscus injuries and possess an inherent capacity for self-repair.[1]
- Posterolateral Corner (PLC) Knee Injuries: BMAC injectate may help with healing in complex soft tissue injuries to the structures on the outer side of the knee, where typical healing can be limited.
- Spontaneous Osteonecrosis of the Knee: This is a condition where interrupted blood flow leads to bone tissue loss near the knee joint. Procedures using BMAC injectate may be considered in the early stages to deliver concentrated healing agents to the area, which may support new tissue growth and better blood flow in the bone.
- Bone Marrow Lesions in the Knee: These are areas of swelling and injury within the bone tissue near the knee joint. By introducing concentrated healing agents, BMAC may help reduce inflammation and may promote tissue repair at the injury site.
- Anterior Cruciate Ligament (ACL) Tears: In specific cases, BMAC may support the healing of partial ACL injuries by delivering healing agents directly to the damaged ligament.
How Procedures Using BMAC Injectate Work
Procedures using Regenexx injectates follow a precise series of steps that may help ensure a high standard of quality. Here is what is typically involved in the Regenexx approach:
1. Bone Marrow Collection
The process begins with a physician collecting a small amount of bone marrow from the back of the hip. Local anesthesia is used to numb the area for better patient comfort. This step takes only a few minutes and is performed with the patient lying on their side or stomach.
2. Processing and Concentration
Next, the sample is taken to specialized laboratory environments for processing using Regenexx proprietary processing. The healing agents contained in the bone marrow, such as platelets and specialized cells, are separated and concentrated to create the BMAC injectate.
3. Image-Guided Injection
Once prepared, the concentrated injectate is injected into the specific area of the knee that needs support. The physician uses ultrasound or fluoroscopy (a type of real-time X-ray) to help guide the needle with precision. This may help ensure that the healing agents reach the area of injury.
4. Immediate Aftercare
Following the procedure, the patient will be monitored briefly and provided with clear instructions to support recovery. Most patients can return home the same day.
There might be some mild soreness or swelling at the collection or injection site, but most are able to resume light activities in a few days, following the physician’s recommended advice.
What To Expect From Procedures Using BMAC Injectate
Before undergoing a procedure using bone marrow aspirate concentrate (BMAC) injectate, patients treated under Regenexx protocols are carefully evaluated and educated about what the process may involve. Here’s what to keep in mind:
Benefits
- Non-Surgical Approach: BMAC procedures are minimally invasive and designed to be performed without typical surgery, which may help reduce downtime and the risk of complications.
- Use of Body’s Own Healing Agents: BMAC uses concentrated cells and healing agents from the patient’s own bone marrow, supporting the body’s natural healing ability.
- Potential for Improved Function and Reduction in Pain: Some patients may experience reduced pain and better knee movement as their condition improves.
- Customized Treatment: Each procedure is customized and carefully planned to address the specific area of injury or degeneration.
Risks
- Procedure-Related Discomfort: Patients may experience mild pain, swelling, or bruising at the collection or injection site.
- Infection or Bleeding: Although rare, as with any injection, there is a small risk of infection or bleeding.
- Variable Outcomes: Results may differ, and not all individuals experience the same level of improvement.
- Temporary Increase in Symptoms: Some patients may notice short-term soreness or swelling as the body responds to treatment.
Considerations
- Comprehensive Evaluation: A thorough medical assessment helps determine if BMAC injectate is the right option based on the patient’s overall health, knee condition, and treatment history.
- Recovery Timeline: While recovery is typically brief, individual timelines will vary. The physician will provide customized guidance for resuming activities.
- Realistic Expectations: Discuss goals and concerns with a physician in the licensed Regenexx network to understand potential results.
- Ongoing Care: Follow-up visits may be needed to monitor progress and adjust the care plan as necessary.
Evidence And Results
Available data from clinical studies and the Regenexx Provider Patient Registry indicate that procedures using BMAC injectate may contribute to functional improvement and relief for certain knee conditions.
Data from a four-year study involving patients with severe OA suggests significant improvements in patient-reported function and pain scores over time.[2] Furthermore, a clinical review indicates that BMAC may offer short- to mid-term functional improvement and may have the potential to delay the need for joint replacement surgery in some patients.[3]
When used to augment meniscus repair surgery, BMAC has been shown to result in greater improvements in the early post-operative period (up to six months) compared to surgeries that were not augmented with BMAC.[4] While some procedures, such as ACL reconstruction, may not see significant improvements in early patient-reported outcomes with BMAC augmentation, research has shown potential benefits in supporting graft recovery.[5]
It is important to note that while research is ongoing, limitations exist. The degree of benefit may differ depending on the specific procedural approach, patient selection criteria, and the severity of the condition. Outcomes in clinical trials and reviews can also vary due to differences in BMAC preparation methods and follow-up length.
Individual outcomes may vary. For more information about patient outcomes, please visit our Patients’ Results page.
Explore Specialized Options in Regenerative Care
Not all BMAC procedures are the same. Differences in processing, injection technique, and patient evaluation can influence results. The Regenexx Approach offers a specialized method and may help patients achieve the best potential of BMAC by focusing on:
- Proprietary Methods: Processes designed to support a higher concentration of healing agents.
- Image-Guided Precision: Injections performed using ultrasound or fluoroscopy for accurate needle placement.
- Registry-Backed Outcome Data: Use of the Regenexx Provider Patient Registry to monitor real-world results and improve care.
- Thorough Screening: Comprehensive screening to identify candidates who are most likely to benefit.
- Strong Compliance and Safety Standards: Careful adherence to regulatory requirements and safety protocols.
The Regenexx Approach To BMAC for Knee
Procedures performed by physicians in the licensed Regenexx network stand out for the rigorous protocols used for BMAC injectate to address knee concerns. Key features include:
- Regenexx-SD Same-Day Procedure: A specialized process in which bone marrow is collected, processed, and re-injected on the same day, supporting timely and recommended use of healing agents.
- Higher Cell Yield and Quality: Proprietary lab techniques are used to achieve optimized concentration and quality of the injectate, which may enhance the potential for tissue repair.
- Patient Registry and Published Outcomes: Continuous tracking of patient experiences and outcomes through the Regenexx Provider Patient Registry helps guide improvements and ensure transparency.
- FDA-Compliant Standards: Procedures follow strict guidelines for safety and regulatory adherence.
- Setting Realistic Expectations: Patients receive a thorough evaluation and education to help understand what BMAC injectate may and may not achieve for their specific knee condition.
Physicians in the licensed Regenexx network focus on providing informed, non-surgical options customized to the patient’s needs, with ongoing monitoring to help achieve their best potential.
A Patient-Focused Path To Improved Knee Health
The Regenexx Approach to procedures using BMAC injectate offers individuals a non-surgical alternative for addressing chronic knee conditions and injuries. By following rigorous, proprietary protocols for harvesting and concentrating the body’s own healing agents, physicians in the licensed Regenexx network aim to support natural repair processes.
Curious about non-surgical options for knee concerns? See how this approach may help improve function and activity levels.
Sources:
- Keyhani S, Esmailiejah AA, Mirhoseini MS, Hosseininejad SM, Ghanbari N. The Prevalence, Zone, and Type of the Meniscus Tear in Patients with Anterior Cruciate Ligament (ACL) Injury; Does Delayed ACL Reconstruction Affects the Meniscal Injury? Arch Bone Jt Surg. 2020 May;8(3):432-438. doi: 10.22038/abjs.2019.39084.2076. PMID: 32766404; PMCID: PMC7358246.
- Pabinger, C., Lothaller, H. & Kobinia, G.S. Intra-articular injection of bone marrow aspirate concentrate (mesenchymal stem cells) in KL grade III and IV knee osteoarthritis: 4 year results of 37 knees. Sci Rep 14, 2665 (2024). https://doi.org/10.1038/s41598-024-51410-2
- Park D, Koh HS, Choi YH, Park I. Bone Marrow Aspirate Concentrate (BMAC) for Knee Osteoarthritis: A Narrative Review of Clinical Efficacy and Future Directions. Medicina (Kaunas). 2025 May 6;61(5):853. doi: 10.3390/medicina61050853. PMID: 40428811; PMCID: PMC12113016.
- Massey PA, Zhang A, Stairs CB, Hoge S, Carroll T, Hamby AM. Meniscus Repair Outcomes with and without Bone Marrow Aspiration Concentrate. Orthop J Sports Med. 2019 Jul 29;7(7 suppl5):2325967119S00283. doi: 10.1177/2325967119S00283. PMCID: PMC6668001.
- Park JY, Ng Hing Cheung JA, Todorov D, Park SY, Lim H, Shin E, Yoon A, Ha J. Biological augmentation of anterior cruciate ligament reconstruction with bone marrow aspirate concentrate: a systematic review and meta-analysis of randomised controlled trials. Int Orthop. 2025 Jan;49(1):35-43. doi: 10.1007/s00264-024-06380-5. Epub 2024 Nov 22. PMID: 39572452; PMCID: PMC11703946.
