So I have called Dr. Gorgeous. Gee, the things a girl will do just to see a good looking man!
An a unison fracture is, and I quote from Wikipedia.
"An avulsion fracture is a bone fracture which occurs when a fragment of bone tears away from the main mass of bone as a result of physical trauma. This can occur at the ligament due to the application forces external to the body (such as a fall or pull) or at the tendon due to a muscular contraction that is stronger than the forces holding the bone together.
Highly trained athletes can overcome this neurological inhibition of strength and produce a much greater force output capable of breaking or avulsing a bone."
Check out that LAST sentence!!!!! I am a highly trained athlete!