http://www.theglobeandmail.com/sport...rticle1918328/

Scientists can’t peer into the brains of hockey players the instant they get a concussion, so University of Ottawa researcher Blaine Hoshizaki does the next best thing.
He reconstructs hits to the head in the National Hockey League using metal head forms and equipment that can land a blow in precisely the same way, for example, that Dave Steckel’s shoulder connected with Sidney Crosby’s head. A sophisticated computer model then shows the impact on brain tissue, the stress and strain as it rotates slightly inside the skull or when different parts of the brain move against each other.
It is this kind of movement inside the skull that causes concussions, also known as mild traumatic brain injuries, and Hoshizaki wants to learn more in order to build a better helmet.
Hockey helmets do a good job of protecting players from catastrophic brain injuries such as skull fractures, but Hoshizaki hopes his research will eventually lead to designs that are more effective at preventing concussions.
On Wednesday, the doctor summarized his findings for the Reebok-CCM Hockey Safety Summit in Ottawa, which brought together representatives from the NHL, Hockey Canada, USA Hockey and other organizations. He described how helmets are now tested only for linear acceleration, which occurs, for example, when a head hits the ice. But he says they should also be tested for how they perform when a hit comes from the side.

Interesting stuff. I did a fair amount of reading last night on concussions in sports and if there's anything that can be done to improve player safety I'm all for it.