If I had to guess, its probably a mix of guys tackling lower due to rule changes and certain types pf practices being restricted by amount for the past couple of years.
Quote:
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The NFL implemented a number of changes this year that were intended to reduce the number of injuries. In March, NFL owners agreed to eliminate “all chop blocks and peel blocks by running backs outside the tackle box,” ban “players from pushing teammates at the line of scrimmage in order to block punts” and expand “defenseless-player protection to include interception returns.” None of these arcane changes have had any noticeable impact on the total number of injuries thus far. The NFL claims that previous rule changes have reduced the number of concussions sustained by NFL players.
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http://thinkprogress.org/sports/2015...-nfl-football/
They tried to get rid of high hits and the chop style but instead of coaches teaching players to tackle the body, most are probably going lower towards the knees for easier tackles.
http://www.pro-football-reference.co...5/injuries.htm
A big bulk of this year's injuries are towards the foot and knee areas.
Another quick search might suggest something a bit more sinister if Brady Quinn is right about how players are using and hiding their HGH use.
http://nesn.com/2015/11/brady-quinn-...uries-in-2015/