[Syd Thrift]

Injury proneness is increased when a player gets hurt to a given part of their body (if they suffer a leg injury, their future proneness goes up for leg injuries, etc.). A minor injury will barely push the needle but yeah, major ones can push a player over from Normal to Fragile. There's no real way to "turn back the clock" on that either. As much as this may suck, it does model real life; one of the reasons why older players aren't as effective is that they're constantly suffering from niggling little injuries, and that just gets worse the older you get.