leadweight once bubbled...
I am no medic, but it seems from experience that joint problems frequently get worse after diving. My guess is it is the combination of cold, handling tanks and climbing laders.
There's a sying that goes... "Life begins at 40...it's just too bad all the parts are wore out."
I have a couple of old sports injuries that I've wondered the same thing a couple of times. But it has always been an inflammation of an old spot (and, coincidently, in cold water).
Doc? Is there statistical evidence that old injuries are more susceptable to DCS, even well within the major agency recreational tables, or is it anecdotal & coincidental?