Allegedly there was the woman who suffered fractures because some screener made her remove her walking cast.

While I don't know of any others, I am certain that there must be a lot of people with back, hip, etc. conditions that are aggravated by having to stand in a long line creating more pain than would otherwise be normal.

I, for one, can walk all day if I move at a good clip but I can't stand in place or move slowly for more than about 5 minutes before my back starts to act up.