What is the most fragile bone in the body?

Pinky toe: Although it may not be structurally the most "fragile" bone in the body, the most often broken bone in the body is the 5th (or pinky) toe. In some sports, like sailing, the pinky toe is broken in 50% of athletes who are involved in the sport for more than 2 years.

Arrrgh: The small toe bones are the most commonly fractured bones. Most sailors have broken the small toe. Construction workers also break foot bones frequently, especially if they do not wear steel toed shoes. Technically, there is no most fragile bone as the tiny bones of the inner ear would be easy to break but don't due to their location.