Our aim is to analyse the clinical outcome of a series of patients affected by avascular necrosis of the femoral head and treated with core-decompression technique and autologous stromal cells of the bone marrow.We enrolled in our study 29 patients with 31 hips in total affected by avascular necrosis of the femoral head. The clinical and radiological outcome has been assessed through self-administered questionnaires (HHS, VAS and SF12) X-ray and Magnetic Resonance.Of all the examined hips, 25 showed a relief of the symptoms and a resolution of the osteonecrosis, 11 of these were at Stage I and 14 at Stage II. The progression of the disease occurred in 6 hips (2 Stage II, 2 Stage III and 2 Stage IV). Our results show a significant decrease in joint pain level and a success in avoiding or delaying the need of hip replacement in early stages of osteonecrosis.