Generally speaking, a broken finger can be reattached within 6~8 hours, and in some special cases, it can be reattached 8~24 hours after the injury.
The best time for replantation of broken fingers is generally 6~8 hours, the earlier the better, the higher the chance of survival, because the effects of tissue ischemia and hypoxia are relatively minimal within 6~8 hours after injury, and after the time of tissue ischemia for a long time, the vascular and neural function is generally difficult to recover, and the survival rate of replantation will be significantly reduced.
It should also be pointed out that there are many clinical cases of successful re-implantation of severed fingers within 8~24 hours after injury, which generally requires a relatively clean and neat trauma, such as cutting injuries, and there is no obvious contamination, and the injured limb is well preserved.