Numbness on the top of the foot after thigh surgery may be a normal manifestation of anesthesia, or it may be caused by poor circulation, low blood potassium, or prolonged time in one position. It can be relieved by massage, acupuncture, etc., or treated with medication. 1. Normal performance after anesthesia: If the thigh surgery is the anesthesia of lumbar anesthesia, then after the surgery is just over, it may be that the anesthesia has not yet passed, thus causing numbness on the surface of the foot. Generally is a normal phenomenon, will improve on its own without the need for special treatment. 2. Poor blood circulation: most of the numbness on the top of the feet after thigh surgery is caused by poor blood circulation in the extremities, which can be relieved by appropriate massage or acupuncture by professional doctors to promote blood circulation. 3. Low blood potassium: If the patient’s blood potassium is too low after the operation, it will also cause numbness on the top of the foot, which needs to be treated with potassium supplementation, such as oral potassium chloride solution, potassium chloride controlled-release tablets and so on. Prolonged posture: After some leg surgeries, it may be necessary to elevate and fix the affected limbs, and then the patients may have numbness on the tops of their feet, which can be relieved by appropriate massage. It is recommended that the patient under the guidance of the doctor to carry out the appropriate treatment, do not blindly carry out on their own, so as to avoid aggravation of the symptoms. The use of drugs need to follow the doctor’s instructions.