Proximal humerus fractures are one of the most frequent fractures especially in over 65 years of age. Due to the increase in geriatric population, also an increase is expected in the prevalence of these fractures and it`s complications like non-union. Non-union prevalence was reported between 1–20% in the literature. The patients with non-union have severe pain and functional limitations. Fracture type, displacement, medial calcar disruption, non-anatomical reduction, inadequate fixation, factors related to patient (smoking, steroid usage, romatoid arthritis) are the risk factors for non-union. The treatment method is determined according to patient`s bone stock, bone quality, type of the atrophy, vitality of the humeral head, integrity of the rotator cuff, and the tubercules. Open reduction, plate fixation, and bone grafting is preferred in patients who had good bone stock and quality. High rate of union and good functional results were reported with this method. If the patient has poor bone stock or avascular necrosis of the head arthroplasty is performed. Anatomic fixation and the union of the tubercules is the most important factor for good functional results. The reverse total shoulder arthroplasty is preferred in patients with rotator cuff deficiency or tubercule malposition. Pain relief can be achieved successfully with arthroplasty but functional results were not improved as much as primary arthroplasty, and dislocation rates were high. The patient should be evaluated clinically and radiologically very carefully, then the treatment method, which was suitable for that patient, should be determined. If possible, osteosynthesis method should be considered initially.