What Is It?
When a bone breaks or cracks, the injury is called a fracture. "Fractured" and "broken" mean the same thing.
In the arm, a fracture most often occurs in the long and slender shaft of one of the three arm bones. The three arm bones are the humerus, radius and ulna.
Fractures of the humerus (upper arm bone)
The humerus is the bone that extends from the shoulder to the elbow.