The Effect of the Cold Arm Sling Elevation Pillow on Postoperative Anxiety and Comfort in Children

Experimental Arm * Intervention Name: Cold and Arm Sling Elevation Pillow * Description: A multi-functional device based on Kolcaba's Comfort Theory that integrates three components: 1. Elevation Module: Maintains the limb above heart level to reduce postoperative edema. 2. Cold Application Module: Waterproof sleeve with velcro fasteners for intermittent cold gel pack application (15-20 minutes per hour for the first 24 hours). 3. Arm Sling Function: Adjustable straps allow the pillow to function as a stabilizer during mobilization. The device features a child-friendly "teddy bear" design to reduce medical anxiety. Active Comparator Arm * Intervention Name: Standard Clinical Care * Description: Routine postoperative care according to hospital protocol, including: 1. Elevation: Using standard hospital bed pillows to support the limb. 2. Cold Application: Separate ice gel packs wrapped in gauze/towels, applied for 15-20 minutes every hour for the first 24 hours. 3. Stabilization: Use of a standard fabric arm sling during patient mobilization