The goal of this clinical trial is to learn if ketamine, given during surgery, can help improve recovery for adults with serious orthopedic trauma. The study will test whether ketamine reduces pain, lowers the need for opioids, and improves mental health outcomes like depression and post-traumatic stress disorder (PTSD). The main questions it aims to answer are: Does ketamine reduce pain after surgery compared to standard anesthesia? Does ketamine reduce the amount of opioids patients need for pain control? Does ketamine improve symptoms of depression and PTSD after orthopedic trauma? Researchers will compare patients who receive ketamine during surgery with those who receive standard anesthesia without ketamine to see if ketamine helps improve both physical and psychological recovery. Participants will: Be randomly assigned to receive either a single dose of ketamine or standard anesthesia during surgery. Report their pain using a simple pain scale (Visual Analog Scale, VAS). Complete short surveys about mood and mental health (PHQ-9 for depression and PCL-5 for PTSD) at several time points after surgery. Allow the research team to review their electronic medical records to measure opioid prescriptions during recovery. Attend follow-up visits in clinic or by secure telehealth (e.g., Zoom) at 1-7 days, 2-3 weeks, 6 weeks, 3 months, and 6 months after surgery