In modern life, there are more and more cases of severed fingers caused by machinery, traffic accidents and other reasons. The only way to recover best is to have a replantation surgery. However, there are some cases that are not suitable for replantation surgery: 1. Those who suffer from systemic diseases, poor health or serious organ injuries that do not allow prolonged surgery are not suitable for replantation; 2. Those with multiple fractures or serious soft tissue injuries; 3. Even if the blood vessels are connected, it is still difficult for the replanted finger to survive due to extensive blood leakage and thrombosis in the soft tissue; 4.The replantation time limit is excessively exceeded and the tissue has degenerated, so replantation is not suitable. Without refrigeration, the finger may still survive 24 hours of ischemia, and the time limit for replantation can be extended to more than 30 hours if the finger is refrigerated immediately after the injury. However, the shorter the ischemic time, the higher the survival rate of replantation; conversely, the longer the ischemic time, the lower the survival rate of replantation. Doctors suggest that after a traumatic hand injury, proper treatment of the wound, proper preservation of the severed finger, and timely access to the nearest hospital will help the recovery of the traumatic hand injury and the success of the replantation of the severed limb.