Okay so after reading the other comments I'm thinking you want it to act like a dislocated, broken or a limb whose bone popped out of its joint. I dont see any reason to honestly.
Realism isnt really the aim of the game, there are more bugs and issues that have to be fixed. Aesthetics isnt too important. Besides, the way fracs work now, you can play even with fracs, which does take skill but it's possible. With your suggestion, it'd be totally impossible with your joint flinging all over the place.
If you want something like this, ask a modder or something.
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