Methods for bone regeneration using endothelial progenitor cell preparations

A method of repairing a bone defect in a subject in need thereof which comprises administering to the subject a therapeutically effective amount of a cell preparation comprising endothelial progenitor cells, a pharmaceutically acceptable carrier and a viscous biopolymer, wherein the endothelial progenitor cells are allogeneic or are recovered from the individual being treated, the bone defect is a delayed or non-union fracture or a bone defect caused by trauma, bone resection or radiotherapy, the subject is a human, and the endothelial progenitor cells are administered at least 10 days after the injury or at least two weeks after the trauma, bone resection or radiotherapy, wherein the endothelial progenitor cells are administered in a range of concentrations of 107-1011 cells per ml of the pharmaceutically acceptable carrier.