Bone marrow aspirated concentrate (BMAC) is an injection therapy used for the treatment of arthritic, painful joints. BMAC contains mesenchymal stem cells along with platelets to accelerate the healing process or provide cells where they are otherwise unavailable. It is most commonly used in knees, hips and shoulders, but can be used in other joints and spinal discs as well. It is best suited for patients who have failed more traditional treatments for osteoarthritis (anti-inflammatories, physical therapy, bracing, steroid injection, viscosupplemantation) and would like to avoid or postpone a total joint replacement. Some patients may consider this treatment if they are not considered to be a good candidate for a joint replacement because of other medical conditions.