osteochondritis dessicans is an idiopathic disorder due to subchondral bone necrosis that generally affects the medial femoral condyle as well as above lying cartilage.[1]the incidence of patients with OCD of the knee aged 6–19 years was 9.5per 1,00,000 overall and 15.4 and 3.3 per 1,00,000 for male and female patients, respectively. [1] The aetiology has been hypothesized as being multifactorial and could either be due to trauma or microtrauma along with metabolic, endocrine and genetic disorders leading to subchondral necrosis. The typical treatment for stable lesions that fail nonoperative management, or have factors associated with poor healing, is trans–articular or retroarticular drilling.[2] Bone marrow aspiration concentrate is a source of mesenchymal cells and growth factors – mesenchymal cells can differentiate into chondrocytes or osteocytes. Moreover, this process being a safe procedure, the morbidity is less. Use of BMAC has been applied in treatment of osteoarthritis, fracture non–unions, and full thickness osteochondral defects. This article is a summation of the procedure we followed with pre op and intra operative pictures of how the BMAC was injected using an arthroscopic method.