He had one concussion that I can remember. I think Foster's issue was more with a serious abdominal wall tear that he kept reinjuring. Had 2 surgeries within 5 months on it, came back and then got another injury in the abdominal area:
http://usatoday30.usatoday.com/sport...-23-foster.htm
Hopefully that's all been dealt with and he can be a productive player.
Edit: Here's a better overview of his injuries:
http://slam.canoe.ca/Slam/Hockey/NHL...75270-sun.html Hip Injury and Surgery, Abdominal Injuries and surgery, concussion. Perhaps we should bubble wrap the kid.