A fracture is a broken bone. In a simple fracture, the skin is not broken. In a compound fracture, a broken end of the bone pierces the skin. Whenever a fracture is feared, the first thing to do is to prevent motion of the broken part. Suppose that an inmate has just tripped on a stairway and twisted his ankle. He says it hurts badly, but you cannot tell what is wrong merely by looking at it. Of the following, the best action to take is to