The right foot knee surgery to play two nails, after the operation can not lift up the consideration of local soft tissue bleeding, muscle atrophy, damage to the muscles or nerves and so on caused by the following. 1. Local soft tissue bleeding: local soft tissue bleeding after surgery, the formation of hematoma, the knee joint caused by compression, you can follow the doctor’s instructions orally activate blood circulation and eliminate blood stasis, swelling and pain relief drugs (such as blood circulation and pain relief capsules, etc.), to accelerate the disappearance of hematoma. 2. Muscle atrophy: After surgery, it is usually necessary to be braked and immobilized for a long period of time, which is easy to develop muscle atrophy and muscle strength will decrease, resulting in weak muscle contraction, which leads to the situation that the right foot can not be lifted up. 3. Damage to muscles or nerves: it may be due to the damage to the nerves or muscles of the affected limbs caused by the surgery, which leads to the decrease of muscle strength and the inability to lift the legs. In addition, it may be due to the physiological pain caused by the surgical wound, coupled with the patient’s psychological fear, which will amplify the feeling of such pain and cause the patient not to dare to lift his feet. It is also not ruled out that it is caused by other factors, and it is recommended that the patient should follow up with the doctor in time, so that the doctor can clarify the cause and give targeted treatment.