Arshavin doesn't come across to me, as the most well built player in our side and yet, he has been available for practically, all the time, since he's been here. I don't think you can count Wilshere as one of those who are never injured because he's been playing regularly for only a season now. We were bragging about Vermaelen after one season but, we all saw what happened now.
I think, RvP and Walcott are generally injury-prone. They come under the "weak" player category and tend to get injured a lot, in game, from "hits". Fabregas, now, has a problem with his hamstring and can't go a month without getting injured. He'll have to sort out his problems in the summer or his injuries could make him a Van Persiesque liability(may be not, since we have a good player in Ramsey to.deputize)
Diaby is not built weakly but his lanky form might be contributing to his injuries. I'm not very sure about him, but, it is sort of clear that he never really recovers fully and his injuries are linked, more often than not.
Other players are not really all that problematic, but we've had these horror injuries (Ramsey and Eduardo) and undiagnosable ones (Rosicky and Vermaelen) which haven't helped our case either.
