from the CP at TSN,

A new study says a recent NHL rule change designed to cut down on the number of concussions in the league hasn't made a difference.

The research suggests the rule, which outlawed bodychecks aimed at the head and checking from a player's blind side, has not led to lower concussion rates among pro hockey players.

The senior author of the work says part of the problem is that referees aren't enforcing the rule.

And Dr. Michael Cusimano says another issue is that these types of incidents aren't the major cause of concussions in hockey.

Cusimano says fighting is a more common cause of concussions in the sport.

continued