I wasn't really looking at that for the reason you state, but the quarterly data above shows a significant injury rate increase (p<.05) year on year from sample sizes of 9000+ starters. For those whose minds are boggled by statistics, that means that there is less than 5% chance that the increase in injury rates is due to chance. From the data I have seen, I don't see how you could possibly argue that injury rates haven't worsened in the last two seasons let alone that they have improved.