PWInsider.com is reporting that former World Heavyweight Champion Mark Henry suffered what is believed to be a hyper-extended knee at this week's Smakcdown tapings. The injury occurred when Henry was throwing a punch, and his knee moved forward before he completely planted his foot. Henry had been working through a groin injury over the past few weeks.

The finish of Smackdown had to be changed on the fly due to the injury. Originally, Daniel Bryan was going to attack Big Show with a chair after Show got Henry down. Henry would then make a comeback, chokeslam Bryan and leave him in the ring. The show would of ended with Henry splashing Bryan, leaving his ability to defend his championship in doubt on Sunday.

When more information is available, we'll pass it along.