Non-union still is a clinical problem with unknowns although current technological advancements of surgical fixation techniques for fractures. When considered the role of poor local vascularity, significant success rate of reconstructions with free vascularized bone grafts which is performed via microsurgical techniques enables this method to be mentioned among standard surgical methods for the treatment of non-unions. Especially free vascularized fibular graft is gold standard option among other vascularized free bone grafts regarding its morphological features to treat pseudo-arthrosis of long bones in both lower and upper extremities. Although unfavorable factors such as requiring high degree of microsurgery experience, relatively longer surgery period and associated complications, donor site problems, the use of free vascularized fibular graft which protects endosteal and periosteal blood stream gives satisfactory union rates, also thanks to experienced and equipped surgical team, and well-directed preoperative planning.