The Role of Injury
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 Personally, I can't help but to notice that there seems to be a relationship between injury and knuckle cracking in people who have a tendency toward knuckle cracking. 
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 what kinds of injuries are you interested in using as a comparison? I've had tendonitis in my hand once ouch but i've never broken a bone there. 
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 I'm lucking in that I've never broken any bones.  
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 well, I was really thinking more along the lines of sprains. Or perhaps even less serious injuries. It seems to me that with even minor trauma or strain to a particular joint, the propensity of that joint to "crack" increases. Just a personal observation of mine, maybe other people don't have the same experiences. 
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 I believe there is something to this. I broke my big toe years ago. After it healed the joint cracked very easily for several years. It was markedly different than the other big toe. 
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 i don't know if it has anything do do with my joint-cracking personally - but i have fractured my wrist - which i crack now. I have also had a hole in my head from smashing my head on a lamppost - i didnt do it, i fell from something. I don't know if the head thing is related but it might be. 
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 Not speaking of any hand injury here, because my knuckle cracking started basically because I was curious how it was done one day and boom…been doing it ever since. 
 But my back and my neck are the direct result of my injury - a fall down the stairs three years ago where I ended up with a vertebral subluxation. That's when the back cracking started, b/c it does tend to help the discomfort. As for the neck, it started getting stiff like a year to a year and a half ago, but I only started cracking it I think...this summer.
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 Injury and cracking do seem to have a link… i developed a bad and cracking back after i got hit hard in the back :oops: 
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 Yep in my opinion i think there is a definite link between the two. 
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 yup, agreed