D. Stephen Heersink at dshsfca@ixpres.com wrote on11/22/04 6:54 AM:

Two suggestions -- the best I know of.  Cosequin or Glyco-Flex.  Either can
be bought through a veterinarian, or (a bit less expensively) through one of
the several online pet pharmacies.  Cosequin is my choice, because it comes
in a capsule to be opened and sprinkled over canned food.  Easy to use, and
very palatable.  Glyco-Flex is a flavored tablet which is easy IF the cat
likes it; otherwise not so easy.  Both of these are dietary supplements, and
have no known risks associated with them.

There are effective pain medications as well, which are a blessing when
needed, but have potentially serious side effects and the cat must have
regular blood work done to insure safety.  I'd definitely try a supplement
for two or three months before turning to a pain medicine.