When a patient develops an external deformity, if the patient is young or in a period of growth and development, it can be corrected appropriately with an external fixation orthosis or external fixation anchors. If conservative treatment is ineffective, and the patient is already mature or adult, then according to the patient’s deformity angle, the deformity needs to be solved by surgery. After surgery, it is necessary to pay attention to preventing infection, avoiding joint infection and redness, swelling and pain. At the same time, it is necessary to carry out appropriate functional exercises of the knee joint, so as to ensure the mobility of the knee joint, not to affect the quality of life of the patient, and to ensure normal walking.