Pic: Forrest Griffin's knee that knocked him out of UFC 155 Phil Davis fight

@ForrestGriffin

This particularly graphic picture shows Forrest Griffin's knee and illustrates why it is he was forced to pull out of his planned UFC 155 match-up against Phil Davis on Dec. 29 in Las Vegas, Nevada.

Well this is disgusting.

Forrest Griffin was all set to return to action at the Ultimate Fighting Championship's (UFC) annual year-end event, UFC 155: "Dos Santos vs. Velasquez 2" on Sat., Dec. 29, 2012, at the MGM Grand Garden Arena in Las Vegas, Nevada.

Then, he hurt his knee in training and was forced to pull out.

These things happen in MMA but normally we aren't privy to the gruesome images of it. And this one is nasty, coming by way of Forrest's Twitter account with the following message:

"This is what you get for Christmas when your (sic) naughty."

Forrest_s_knee_medium

Yuck.

No timetable has been set for his return.

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