Yes, the concept that blunt-force trauma of the head causes brain damage is a generally accepted principle of medicine. That is why I was so appalled by the NFL doctors who were denying my work.

All the NFL players I have examined pathologically, I have not seen one that did not have changes in their brain system with brain damage.

As a physician, I'm somewhat an advocate of patients. How come, before Mike Webster, no NFL player was told or knew that there was an intrinsic risk of brain damage from playing football?

Chronic means long term. Traumatic means associated with trauma. Encephalopathy means a bad brain.

A child who plays a game of football for one season without any documented concussion - several months after that season, if you subject his brain to sophisticated psychological testing and radiological testing, functional MRIs, there is evidence of brain damage.

There is no safe blow to the head, especially for a child.