If you've been in an accident and heard a snap, you may have a broken bone. A broken bone, also known as a fracture, is a serious injury that requires medical attention as soon as practically possible. Here is everything you need to know about breaking a bone. How to Know if You Have a Fracture Sometimes it's easy to tell you have a broken bone. For example, if the bone is protruding through the skin, you can assume that you have a a fracture.