I recently had both knees replaced by Dr. Nguyen. He gives everyone a metals patch test and recommends the more expensive metals blood test which I did take. Better to be sure you are not allergic to the metals used than to go through what you did. He uses a ceramic coated metal knee if you are allergic to metals. He does revisions as well. I can't believe most doctors do not test for metals allergy. Of all the friends and relatives I know who had total knee replacements none of them were given a metals allergy test.
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