where are the bumps on ankles?
do you have any picture or x rays of it.
are the painful ?
has a stone analysis been done ever?
what is your serum uric acid , calcium and phosphorus level ?
yes, sometimes kidney
stones and painful crystal deposits on joints can be part of same disease like gout
and calcium pyrophosphate crystal induced arthropathies.
also get your urine test and kidney functions if there is swelling on feet.