Bears WR Luther Burden's groin injury to keep him out for preseason, expected back Week 1

One of the Bears’ most exciting weapons for the upcoming season likely will be shelved until the season starts. Wide receiver Luther Burden injured his groin Saturday and is expected to miss the rest of the preseason. The team hopes to have him back for the season opener Sept. 13 at the Panthers. In the meantime, the Bears have preseason games against the Browns, Bengals and Titans, as well as joint practices with the latter two. When asked how much of an issue that is, coach Ben Johnson told…