Thromboembolic complications are a serious risk for patients undergoing major orthopedic surgery, especially total hip or knee replacement. Deep vein thrombosis and pulmonary embolism are common thromboembolic complications that can develop if blood clots form in the deep veins of the legs or lungs. Preventative measures such as early mobilization, compression stockings, and anticoagulant medications can help reduce the risk of dangerous blood clots forming after orthopedic surgery.