The advice from Mikel.2 is very sound.
   In my own case, 5yrs.back, I would rise in the morning & for up to
   two hours be unable to touch my porrige spoon or teacup due to
   the extreme pain.
   At that time I happened to purchase a 3 row button keyed box
   [B.C.C"] at a roup[rhymes with pout], not pope as our southern
   neighbours have it,this being the first time I had ever handled
   such an instrument.By dint of long & constant practice I mastered
   the beast & am happy to report that I now only get an occasional
   twinge of pain. I must stress that long hours at a time were
   involved.Drove my long suffering wife up the wall.
   I do not take medication of any kind for the arthritis but
   prefer to use mind over matter,this in my case works very well.
   I do not play any other instrument
   Joe.