3 Corey Hill's leg
As mentioned in the previous slide, the inaugural UFC: Fight for the troops saw two stomach-turning injuries, this being the more gruesome of the two. Standout collegiate wrestler and former The Ultimate Fighter contestant Corey Hill faced Dale Hartt on the undercard.
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In round two, Hill threw a leg kick which Hartt checked. Hill's shin split in half and unable to support his weight, he went down. Neither fighter noticed and it took Joe Rogan's screams to get the referee's attention and stop the fight.
Hill's horrific injury kept him away from the sport for over a year. He died in 2015, aged 36, due to a collapsed lung stemming from complications following a lung transplant.