I think its a lot of issues...
Some Bad luck, no doubt Like Crosby getting face'o puck from orpik last year, Or Malkin doing the board split last game...
I also think the Pens have a heavy reliance on certain players, so they play hurt more than others... Malkin, Crosby, Letang... even Duper this year... looks obviously hurt... still in there and probably going to make it worse...
I think teams play a lot rougher with us, as well... teams that cant skate with us are going to try to physical us into bad plays and retaliation... that can lead to injuries
Finally, I think We havent had a lot of size and physicality, so that leads to two issues:
A.) that the bigger guys we do have try to do too much in the physicality sector, wearing them out and making them suseptable to injury
b.) Smaller guys try to play bigger than they are, which leads to other types of injuries
I dont think its one issue... its a lot...