If a patient is unable to bend after knee-related surgery, he or she can take the following measures: 1. follow-up: immediately return to the orthopedic department for a follow-up consultation and ask the doctor to clarify the cause of the inability to bend the knee, which in most cases is due to the patient’s fear of pain and not to exercise. 2. functional exercise: such a situation arises due to insufficient exercise. The first choice of functional exercise, you can ask a professional rehabilitation physician to guide the patient to carry out gradual passive training, in the process there will certainly be knee pain, to insist on activities within the scope of the doctor’s permission. If the pain is unbearable, you can ask your doctor to prescribe pain-relieving medication. 3. Surgery: For patients with particularly severe lesions or those who have been unable to recover for six months, you can try to have knee release surgery.