@sallysher First, removal of the offending implants will remove the source of chromium and cobalt, so the levels with diminish. One year after revision, my levels had fallen to the normal range. As far as I know, removal is the only long-term solution.
Second, the tremors, gait problems, brain fog and other issues can also be caused by metal poisoning, so it is possibly the reason he is not responding to typical Parkinson treatments.

My revisions, while not fun, resolved all my issues except tremors and an elevated heart rate. I have managed these for over 10 years without a problem.

Finding a revision surgeon is another matter. I was ab P e to get a recommendation from a PT I trusted,