Someone very close to me had back surgery when Steffi plates were newly introduced. Over the years there have been many health problems that have taken place: lactation of breasts without pregnancy; mental disorders including loss of memory, hearing voices, irratic behavior, etc.; and chrons disease to mention a few. She does have allergies to silver and nickel that I am aware of... so I am wondering if perhaps she could be allergic to the plate that was implanted in her back and maybe some of her symptoms are tied to that. The family has exhausted ideas and doctors all disagree on what is happening.