The optimal time for recovery of hand function after cerebral infarction is 3-6 months after the onset of the disease. The final recovery of the hand depends on the degree of brain injury and the time it takes for the patient to fully coordinate the flexion and extension movements of the affected hand. If it can be completed within the same day of the onset of the disease, the patient’s affected hand can be almost completely restored to the functional hand; if it can be completed within 1 month after the onset of the disease, the patient’s affected hand can be mostly restored to the functional hand; if it can be completed within 1-3 months after the onset of the disease, the patient’s affected hand will be restored to the assistive hand for a small part of the patient’s affected hand, and most of the patient’s affected hand will become a handicapped hand; if it cannot be completed within 3 months after the onset of the disease, the patient’s affected hand will mostly become a handicapped hand. Explain the using hand, the assistive hand, and the disabled hand. The function of the hand is divided into five actions: 1) fixing paper in the affected hand and using scissors in the able-bodied hand. 2) holding a wallet in the affected hand and using the wallet in the able-bodied hand. 3) suspending an umbrella in the affected hand for more than 10 seconds. 4) clipping nails in the affected hand. 5) fastening buttons using the affected hand. The utility hand should perform 4-5 of the above maneuvers, and the support hand should perform 1, 2, or 3 of the above maneuvers. 5 maneuvers that cannot be performed by any one of the 5 maneuvers are considered to be a useless hand.