A more thorough explanation:

Permanent injury refers to harm that cannot be reversed or healed. This can happen to a person or property. When determining compensation for damages, the severity of the injury and whether it is permanent or temporary is taken into account.

For example, in the case of Allis Chalmers Manufacturing Co. v. The Industrial Commission et al., an employee suffered a back injury that was diagnosed as a lumbosacral sprain. The court found that the injury was severe enough to warrant compensation for temporary total disability, but not for permanent partial disability.

Another example of permanent injury could be a person who loses a limb in an accident. This injury cannot be reversed and will have a permanent impact on the person's life.

Overall, permanent injury is a serious matter that can have long-lasting effects on a person or property.