So much attention on traumatic brain injury in sports and yet, surprisingly, we don’t often hear of it in connection with mixed martial arts.

MMA is a full contact combat sport. It involves violent strikes to the head, as well as aggressive wrestling maneuvers. The Ultimate Fighting Championship (UFC) is said to be the fastest growing sport organization in the world.

Last week MMA fighter Brian Stann announced his retirement from the UFC.

Before his eight years as a UFC fighter, Stann played football for the US Naval Academy, later going on to fight for the Marine Corps in Iraq.