Knock on wood.

The Eagles had five different starting offensive line combinations by Week 13 of 2012. Left tackle Jason Peters never suited up for a single game. Center Jason Kelce suffered a torn ACL in Week 2. Todd Herremans was on Injured Reserve for the final seven games with a foot injury.

It's been a much different story for the Eagles offensive line in 2013. The Eagles have rolled out the same five-man starting unit for each of the first 11 games and are on track to make it 12 this Sunday against Arizona. The Eagles have set a franchise record with nine games with at least 400 yards of offense and it's no coincidence that the continuity of the offensive line is a big reason for overall unit's success.

"They've played a lot together. I think they've played together now almost 90 percent of the snaps. I think that's important for that unit," offensive coordinator Pat Shurmur said.

"You know, when guys come back from injury you really don't worry about it. I know all the players are exposed to injury. Our guys have done a good job of training their bodies in the offseason and then working and preparing each week, so they minimize those risks. But they've done a good job. Anytime an offensive line can play together for as long or as many snaps as they have, they have a chance to be a good offense."

Here is a more detailed look at what the return of Peters and Kelce this season have meant for the Eagles offense ...