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> To perhaps start another thread, I have a question for our on line
>doctors: I crack my knuckles and sometimes my neck. I have heard that the
>popping noise may be due to the creation of a low pressure area in the joint,
>which cavitates a bubble out of solution in the fluid of the joint.
It is. Get a syringe, half fill it with water, seal the end and pull back
on the plunger. What do you see?
>to do it after diving, but bad habits are hard to break. Since this bubble, if
>that's what it is, normally goes back into solution,
Look closely in the syringe. Does all the gas made by this
decompression/cavitation go back into solution?
>where does cracking a joint after diving fall on a scale of good to bad?
I wouldn't do it, although it may not matter unless some of the gas so
created could escape into the circulation.
/Rat
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
shelps@ac*.ma*.ad*.ed*.au* Stephen Helps
FAX (08)232-3283 Anaesthesia & Intensive Care
Voice (08)224-5495 University of Adelaide
ADELAIDE, 5005, South Australia
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If there is a 50-50 chance that something can go wrong, then 9
times out of ten it will. (Paul Harvey News, 1979)
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