A 28-year-old female underwent Chiari's pelvic osteotomy and a 46-year-old female total hip replacement. Two weeks after the operation both cases complained of sudden onset of chest pain and dyspnea. They were transferred to ICU and were diagnosed as pulmonary embolism. They were saved by emergency operation. The first case took oral contraceptive one week before operation, and the second case was a obese female. They may be risk factors of pulmonary embolism. We must pay a great attention to pulmonary embolism that would be the severest complication after orthopaedic surgery.
