This study aims to evaluate the effectiveness of a clinical pharmacist-led perioperative pain management model in orthopedic surgery. It is a randomized controlled trial involving patients undergoing major orthopedic procedures. Participants will be assigned to either a standard care group or an intervention group receiving comprehensive pharmaceutical care, including preoperative medication reconciliation, intraoperative monitoring, and postoperative analgesic optimization. The primary outcome is the incidence of moderate-to-severe postoperative pain. Secondary outcomes include opioid consumption, adverse drug reactions, and patient satisfaction. This study seeks to establish an evidence-based protocol for optimizing pain management in orthopedic settings.