Numbness of feet after hip replacement may be caused by improper posture, intraoperative nerve damage and so on. 1. Improper posture: If the patient sleeps or sits in an improper posture after hip replacement surgery, the pressure on the legs or feet may cause poor local blood circulation, in which case numbness of the feet may occur. 2. Damage to nerves during surgery: If the nerves in the leg are inadvertently damaged during hip replacement surgery, numbness of the feet may also occur. It is recommended that people with numb feet after hip replacement surgery should go to regular hospitals in time to clarify the cause, and if treatment is needed, standardized treatment should be carried out under the guidance of doctors to avoid adverse effects on the body due to delayed condition.