LANDOVER, Md. (AP) -Washington Redskins right tackle Jon Jansen was carted off the field with a dislocated right ankle early in the second quarter of Sunday's season opener against the Miami Dolphins.
Jansen was hurt when Miami linebacker Zach Thomas rolled onto Jansen's legs while sacking quarterback Jason Campbell. Jansen immediately yanked off his helmet in agony as his teammates quickly surrounded him.
Stephon Heyer, a rookie free agent, took Jansen's place on the next drive.
Jansen, 31, is in his ninth season with the Redskins. He was the team's most reliable player during his first five years in Washington - never missing a start - but his past three seasons have been marred by injuries. His missed the entire 2004 season with a ruptured Achilles' tendon, broke both thumbs in 2005, and labored with a torn calf muscle for much of 2006.
He signed a five-year, $23 million contract extension earlier this year.
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