You will most likely be put into a fracture boot, which has a rounded sole so you do not use your joints while walking. If it is a major hairline fracture, you may be put into a cast.Fracture boots...
A fracture is just another word for a crack in your bone, and the word "hairline" is to imply that the crack itself is literally as thin as a strand of hair. If you knocked a vase over and a thin...