I think there is a little more than confusion here, because unfortunately I did not keep a copy of the original article on the Texan's Web sit, but I believe that article has been changed. Why do I say that, because here is the lead comment from the main page of the Texan's Web Site.
"The Texans are keeping Antwan Peek out of team drills during coaching sessions as he continues to rehab his knee. And that's enabled Charlie Anderson to gain some valuable experience with the first-team defense."
Therefore, don't blame Texan's Posters for having a heart attack over Peek's unexplained ACL INJURY.
Now is it or isn't it a SHOULDER INJURY?