Mark Henry was injured at this week's Smackdown taping in Tucson, Arizona. Henry hurt his knee after throwing a punch without his foot firmly planted on the canvas, causing his leg to bend awkwardly and apparently hyperextending his knee.
The finish of the match was changed on the fly, with Henry rolling out of the ring and being counted out off camera.
The show ends with World Heavyweight Champion Daniel Bryan getting in the ring and going after Big Show.
I haven't heard what Henry's status is for Royal Rumble but it should be noted he's been working over the last month with a groin injury.