I believe the issue raised by Dr. Rhine would benefit from some clarification.
Although the NHL declines to release figures on the number of concussions, it acknowledges that concussions are “on the rise” in the 2010–2011 season.1 The league attributes the increase to accidental hits, which account for 26% of concussions.2 The number of concussions attributed to accidental hits in the 2010–2011 season nearly doubled from the previous season.2 Legal hits account for 44% of reported concussions in the 2010–2011 season.2