MMA Fighting -- More Brain Damage Than Boxing and Football ... Study Says

MMA is the worst sport for head injuries -- even worse than football -- so says a new study.

A University of Toronto study published this month in the American Journal of Sports Medicine examined records and videos from 844 bouts, finding that about 1/3 of them end in a knockout or TKO.

The study says the head trauma rate in MMA is greater than boxing, football and hockey.