There are some implants that are coated with inert materials for use in metal-sensitive patients. It will take some (maybe a lot) of research by you and your doctor to find the best one for you. My ortho docs in Minnesota are part of a large group practice, and actually have a person on staff who specializes in finding the best implants to solve these sorts of problems. Maybe your ortho does as well? The other alternative is to have him contact the Smith & Nephew rep for assistance.
Sue