Because, as it turns out, while science has shown time and again that it does not cause arthritis, it CAN sprain a joint - like any other ligament sprain. And it really sucks if you are, perhaps, an aggressive knuckle-cracker and find yourself in just this predicament.
Prescription? Ibuprofen. And rest; lots of it. For example - wrap it up so you remember not to use it, thus letting it rest. Sheesh.
Wait, you knuckle cracked your way to a sprain? Is this actual evidence that you don't know your own strength? (And after I wrote the second sentence I can't tell if it sounds like I'm complimenting or insulting you.)
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