<qa>  What is the purpose of this study?Rationale and Objectives Epiphyseal necrosis are common in young adults 2000 new cases per year in the Nord Pas -de- Calais region resulting in severe functional impairment and disability . Drilling is the procedure most simple, but its effectiveness and safety are discussed fracture risk , long discharge period , success rates below 50 until stage III. However, it can be optimized in two ways: 1 reducing morbidity and discharge period by reducing the diameter of the channel and percutaneous achievement , 2 increase efficiency , including coverage contribution of stem cells and osteogenic hormone . The purpose of this study is to test the effectiveness of the contribution of these elements to the healing necrosis . 