Sidney Crosby missed about 10 months with a concussion. His recovery was a slow, arduous process that dragged out so long out of the need for caution. Simply put, the Pittsburgh Penguins and doctors were extremely careful with Crosby, not allowing him to return to the ice before returning to 100 percent health.

By doing this, the team was hoping he'd lack the susceptibility to future concussions that many similar patients carry through the remainder of their careers. Well, we don't know if Crosby's return to the sidelines is related to his prior concussion or not, but we do know that he's been having similar symptoms, and now, he's been placed on the injured reserve yet again.

The Penguins announced the news late Saturday on their website and via Twitter.

Crosby has been placed on the IR retroactively, which likely dates back to at least Tuesday, December 6, the day after he suffered this most recent injury in a game against the Boston Bruins. Injured reserve players must stay on the sidelines for seven days, meaning Crosby would be eligible to come off at any point now. But the fact that he's been placed on there at all means he's obviously not ready to return in the imminent future.

For more on the news, check in with Penguins blog Pensburgh.