Some time ago it was disclosed online that American tennis star Williams may have taken birth control pills, which led to a pulmonary embolism, which sounds nothing to do with femoral head necrosis. In fact, if the embolism occurs in the femoral head, ischemic necrosis of the femoral head will occur, and it is likely that the tennis career of Davy will be over. Recently we have seen Davy galloping on the tennis court again, bless Davy! The pathogenesis of femoral head necrosis caused by contraceptives is unknown, and the hypothesized mechanism is due to fat embolism of blood vessels, and its incidence is also unclear. There is no epidemiological report in this regard in China. According to foreign reports, femoral head necrosis can occur in women who have been taking contraceptives for more than 2 years, which may be related to liver damage and hyperlipidemia caused by contraceptives. It is recommended that women who have been taking contraceptives for a long time should go to the hospital regularly to have their blood lipids, liver function and blood rheology checked, and if there are any changes, it is recommended to switch to other contraceptive methods and give active treatment.