I don't know if Temodar side effects include joint/bone pain, but the steroids can have a lasting effect and the pain, while it might feel different, could be further progression of complications for the steroids. Blood clots can be common in the legs of brain tumor patients, this can be serious, and they cause real pain as well. Only your doctor can determine what is causing the pain. A friend of mine (from a BT support group) has dealt with both issues quite a bit, and does lots of Physical therapy and Occupational therapy, acupuncture, swim/water exercise, etc.. etc.. to combat these side effects. All the best to you.