I had what are known as MOM - metal on metal. Specifically a metal femur head ball & a metal acetabular cup liner. The 2 metal surfaces, which were supposed to be "self lubricating" turned out not to work that way - the surface friction wore off bits of metal which deposited in the tissue & worked its way into the blood.

Traditional implants have a cross-linked polymer cup liner and either a ceramic or metal femur head ball.

Do you know which specific implants you have? These are all registered prosthetics, and the doctor and hospital will have a record of this. Once you know, you can look them up to see what metals are in them and what their history is.
Sue