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I am sorry to hear you are dealing with this situation in your thumb - it sounds similar to when I had a failing hip implant and the surgeon kept putting me off - turned out it was recalled, and I ended up with revision surgery and part of a class action lawsuit. When I asked about carbon replacement 3 years ago, my hand surgeon was adamant that it was not yet a proven success and he wasn't doing it. In addition, he felt there is not enough bone in a small hand for successful securing of an implant. It looks like that's what you may have...

If he is part of a group, you could appeal to their Director of Practice, or contact the hospital or surgery center with which he is affiliated to get some response.

Sue