why do joints crackle(pop)?
461700
You're popping the air in the joints.
1167579
Cracking your back by yourself is'nt bad unless your forcing it to pop or crack.    It should be preformed by a professional.  By cracking or popping your joints you are releasing air from the joints and that is good.  A chiropractor has studied the joints and knows which way he or she can manipulate the joints without damaging them.
233628
Getting arthritis from popping your knuckles is just an old myth that most people still buy into.  There are no adverse effects ... other than possibly annoying people around you who hear you doing it.
404241
It's like cracking your knuckles. It's cardon dioxide released from your joints. Totally harmless.
487951
the actual popping sound heard is pockets of carbon dioxide that have accumulated in b/w the vertebrea.  The purpose of the adjustment is to remove nerve interference so that the body can function at its optimum potential. When this interference is removed the nervous system is free and clear and the patient's ability to live in a state of optimum health increases dramatically. Dr's of Chiropractic are experts in identifying a problem with a patient's nervous system and correcting the subluxation. They do not use medications because their philosophy revolves arounf the theory that the power that made the body can also heal the body.
1180661
when you "crack your knuckles", you are actually popping blood pockets in the joints, where no bones exist.\n\nyou are most likely popping these same bubbles where blood fills the tissue.  rock on
648172
im female and what the hell is head with pop rocks? enlighten me x do you mean poppers? you know the stuff you stiff that gets you high for a minute?
1077214
Popping of joints releasing pressure bubbles and was previously thought to cause arthritis.  While this has been largely disproven, it is a VERY bad idea to pop your knees as they are load bearing joints (unlike fingers).  Popping them can cause misalignments that, under pressure could result in injury or dislocation.  Popping is not a physical needs, but a compulsive behavior. Make a decision to stick to your finger and toes.  Steer clear of the knees, back and neck.
1107471
When you are streaming anything, it usually is poor quality so it can be viewed in real time. Due to the poorer quality, you will hear popping.
130733
You may have heard of someone having"TMJ".It is correctly called Temporal Mandibular Joint syndrome.Your TMJ is a movable joint cushioned by a disc called the articular disc.Sometimes the ligament that holds the disc in place gets "stretched out" or in a bad position so it holds the disc loosely.The pop is the articular disc popping in front of the bones in the joint.This may be a bite or occlusion problem,please see your dentist.If the pop is accompanied by pain you may be starting to get destruction in the joint which may lead to surgery.Most times we can make a splint and adjust your bite to take pressure off the joint.Your dentist may refer you to an orthodontist or TMJ specialist.Jill dental hygienist
68409
Okay inside the curnal there is some moisture. And when it heats up the water expands and causes steam so when this happens there becomes less and less room inside the curnal and eventually explodes. Thus causing popcorn to pop.
33199
That is the air bubbles that are "popped" between the musclesand joints when you pull the knuckles
594099
The popping noise is just a change of the fluid in your joints escaping into a gas state.  Artbritis (osteo) is caused from excessive and abnormal joint rubbing.  As long as you aren't twisting the fingers to pop the joint, or you aren't popping them by pulling them backwards, you are safe.  If you move the joint in a direction it was ment to move, you will do no harm.  The other arthritis (rheumatoid) is an autoimmune problem and has absolutley nothing to do with popping the joint.
1160802
the bones get old,  kinda like a rusty wheel without oil [we creak and crack] we loose joint  fluid....   and the bones get spurs.\nplus the joint become inflamed.. in other words we start falling apart
820001
Probably IS arthritis.  There is a web site that gives an excellent explanation of joint cracking.  I have listed it below.
842833
My understanding is that it actually hurts it.  If poping it everyday for many years, arthritis could actually form and cause even more pain and make it harder for you to move.  If you are having problems with your back, go see a doctor and see what can be done.
753881
probably a question for an MD, but it could be a decrease in the amount of cartilage that you have between your bones.  the crackling may result from a decease in this cushion, allowing the bones to rub together, giving a crackling sound.