According to the Herald Article, Welker recently said that he injured just the ACL. If true, the knee was not as damaged as originally thought:
BostonHerald.com - Blogs: Rap Sheet Blog Archive Now, Patriots WR Wes Welker says he injured “just the ACL”
BostonHerald.com - Blogs: Rap Sheet Blog Archive Now, Patriots WR Wes Welker says he injured “just the ACL”