wo helmets crashing into each other and exploding make for an exciting television intro but a terribly bad practice when players are inside real helmets. Crashing helmets make good entertainment, but crashing helmets with players inside can have serious consequences.

It's the first game of the 2006 season as the Kansas City Chiefs and the Cincinnati Bengals face off. Quarterback Trent Green's game ended early following his scramble that was stopped by Bengals cornerback Robert Geathers slamming him to the ground.

As the whistles sound and players start to relax, Green lies unconscious and seemingly lifeless on the ground. Quickly, medical personnel are summoned and begin attending to Green. After several minutes of treatment by the medical staff, Green is placed in an ambulance and dispatched to the local hospital.

Completely strapped to a gurney, Green wakes up and begins trying to wrest himself free from the constraints placed around him to secure him for transport. Only then did Trent Green’s memory return.

What is a concussion?

This describes the occurrence of the highest grade of a concussion, one that involves unconsciousness.

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