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TSN.CA The data showed that there was no statistical significance in the incidence of concussions in the NHL in the 2010-11 and 2011-12 seasons compared to the 2009-10 season. That latter was the year before the NHL rule change went into effect.
The researchers estimated there were about 5.23 concussions per 100 games in the NHL regular season. Despite its stiffer rule, the OHL didn't have markedly different concussion rates, clocking 5.05 per 100 games in the regular season.
The analysis also showed that the type of hits outlawed by the NHL rule weren't actually the major cause of concussions.
About 28 per cent of interactions produced a concussion also generated a penalty call, said Cusimano. In that 28 per cent, the bulk of the penalties were for fighting. "And blindsiding, which was what the rule was initially was written about, was only 4.1 per cent of all those.... But four per cent of 28 per cent is a very small number."
"I wasn't totally surprised, but I was disappointed that we weren't able to show a difference," Cusimano said.
"Part of it's the way the rule's written. Part of it's the way the rule is enforced. Part of it's the penalties associated with the rule. And part of it is that concussions are also coming from other causes like fighting, that is still allowed."