The inability to lift the leg after patellar fracture surgery may be due to the following reasons: 1. local soft tissue bleeding after surgery, forming a hematoma, causing pressure on the knee joint, you can take oral medication to activate blood circulation, reduce swelling and pain to speed up the disappearance of the hematoma. 2. it may be due to the physiological pain caused by the surgical wound, plus the patient’s psychological fear, which will make this pain sensation amplified, try to create a comfortable and quiet We should try to create a comfortable and quiet environment to let patients rest well. The medical staff will try to talk to the patient and give comfort and encouragement to eliminate the pain to a certain extent. 3. It may be due to the damage to the nerves or muscles of the affected limbs caused by the surgery, resulting in a decrease in muscle strength and the inability to lift the legs. 4. .