During surgery, the 3.5Mm Proximal Humerus Plate is positioned on the posterior aspect of the proximal humerus and fixed in place using screws or other fixation devices. The plate provides stability to the fracture site, allowing for proper alignment and healing. The screws are inserted through the plate and into the bone to hold the fracture fragments together. The specific design and placement of the Proximal Humerus Periarticular Posterior Plate allow for fixation and stability of fractures occurring near the shoulder joint.