A list compiled by the Denver Post blamed cut blocks for at least five significant injuries to Broncos opponents since 2001:
Oct. 21, 2001: Chargers defensive lineman Maa Tanuvasa suffers a broken ankle on a cut block by left tackle Matt Lepsis.
Oct. 28, 2001: New England linebacker Bryan Cox blames a broken leg on a clip by right guard Dan Neil, who denies hitting Cox.
Dec. 1, 2002: Chargers defensive tackle Jamal Williams suffers a dislocated ankle when blocked from behind by guard Steve Herndon.
Sept. 19, 2004: Jacksonville defensive end Paul Spicer's leg is broken on a low block by Lepsis.
Oct. 25, 2004: Cincinnati defensive tackle Tony Williams suffers a broken ankle after a cut block by right tackle George Foster.
The Williams one was ridiculous. It was on a screen pass. Herndon cut him from behind and rolled up his ankle when he was no where near the play.
http://cbs.sportsline.com/nfl/story/9606522/1
From a former Broncos defensive lineman...
"It's dirty, there's no question about it," Hayward said. "It's a dirty way to play. But they use it because it works. That's why you're seeing more teams use it. It works. That doesn't make it right. The league has tried to do stuff to make it safer, but they haven't done enough. It's a way a guy can get seriously hurt. It's a dirty system."
And no one should be defending a player using the cut block when the player does it in a Spike play.