1: Age: The Rangers have become significantly younger post-lockout. Younger players statistically suffer fewer injuries (as they have less of the wear and tear variety - back, etc.)
2: Rolling 4 Lines (mainly Renney): Say what you want about rolling 4 lines, but it limits the injury risk. By spreading icetime, it limits players exposure to "accumulated" injuries. While many people see injuries similar to gunshot wounds, many times, another part of your body can dampen/limit the severity of an injury. The more you play, the more worn down you get and susceptible to injuries you become. It's no surprise that teams seem to suffer few or massive amounts of injuries. If a top-6 player goes down, their icetime is further heaped upon the remaining talent (thus widening their exposure), and if another player goes down, the cycle continues and puts further strain on the rest of the remaining talent.
3. Not Having the Flyers Medical Staff: The Rangers have really assembled an admirable training staff in addition to the off-season/off-ice regimens designed by Reg Grant.
Can you imagine if the Rangers had the Devils injury luck this year and vice versa? Scary to even think about.
Right. And the scary correlative of that is this: Even with a huge advantage in healthy players, this team can't seem to do much. In other words, lost man games constitute no excuse for this team's mediocrity over that span of time.