al. transfected lentiviral of miR-26a into CD34+ stem cells, collected miR-26a overexpressing exosomes from CD34+ stem cells (miR-26a-CD34+ exosomes) and found that the miR-26a-CD34+ exosomes could prevent glucocorticoid-induced osteonecrosis of the femoral head by promoting angiogenesis and osteogenesis in vitro and in vivo [39]. This evidence concerns the gene CD34 and osteonecrosis.