INTRODUCTION: In this study, we aimed to investigate postoperative short term outcomes, union status, early and late complications and the relationship between them in patients treated with plate osteosynthesis due to proximal humerus fractures in our hospital. METHODS: A total of 34 patients aged between 18-92 years were included in the study. Patients’ age, gender, fracture pattern, time from hospitalization to the surgery, time from surgery to discharge and comorbidities were recorded and evaluated. RESULTS: The mean duration of hospitalization was found as 3.4±1.7 days. There was no significant difference between the patients with and without comorbidity in terms of the mean duration of hospitalization. There was no significant difference between the patients with and without complications in terms of the mean time from hospitalization to the surgery. According to Neer classification, postoperative late complications occurred in 40% of Neer Type 4 fractures, 29.4% of Neer Type 3 fractures and 8.3% of Neer Type 2 fractures. DISCUSSION AND CONCLUSION: Internal fixation with locking plate seems a reliable option in the treatment of proximal humerus fractures, especially in osteoporotic bones and Neer Type 2 fractures.