Attending surgeons, orthopedic surgery residents, physician assistants and research assistants involved with this study will assist in data collection. For each patient, we will collect demographic data, pre-operative CBC data, intra-operative cell saver auto-transfusion volumes, post-operative number of packed red blood cell units transfused, post-operative CBC data, post-operative drain outputs, and post-operative complications. This information will be gathered from the peri-operative medical records and electronic medical records. Surgeons and clinical and research personnel will review medical chart and progress notes for evidence of clinically significant VTE, reoperation, hematoma, seroma, and infection.