This rather boring GIF represents the agony that some DayZ players are going through. Version .55 just launched, and it looks like randomly broken legs are one of the features that rolled out. Just when you thought the zombie apocalypse couldn't get any tougher.
For what it's worth, it's unknown if this is a bug, or the result of a newly-implemented physics calculation that takes weight into consideration. With regard to the above GIF, people have responded saying it's the amount of gear being toted around that caused a broken leg from a slight fall.