Background: Proximal humerus fractures are common injuries, particularly in the elderly population, and optimal management remains controversial. Locking compression plates (LCPs) have emerged as a preferred option due to their angular stability, especially in osteoporotic bone. Objectives: To evaluate the functional outcome of displaced proximal humerus fractures treated with LCP in adult patients and to analyze the impact of fracture type on clinical results. Materials and Methods: This prospective observational study included 40 adult patients with displaced proximal humerus fractures treated with LCP fixation. Patients were followed at 6 weeks, 3 months, and 6 months. Functional outcome was assessed using the Constant-Murley Score. Fracture types were classified using Neer's system, and outcomes were compared accordingly. Results: The majority of patients were over 50 years old, with 3-part fractures being most common. There was a statistically significant improvement in Constant-Murley Scores from 6 weeks (mean 52.4 ± 6.2) to 6 months (mean 79.2 ± 6.1) (p < 0.001). Functional outcomes were best in 2-part fractures and progressively decreased with increasing fracture complexity (p < 0.01). Conclusion: LCP fixation is effective in restoring shoulder function in patients with displaced proximal humerus fractures, particularly in less complex fractures. Early rehabilitation and careful surgical technique are key to achieving optimal results.

Proximal humerus fracture, locking compression plate, Constant-Murley Score, shoulder function, Neer classification.