Dr. David Fischer

There's only two alloys that are generally used in joint replacement for the metal part.

And it doesn't make any difference whether your implant is made in Asia or Europe or Canada or the US.

These are accepted international alloys.

And one is a chrome cobalt molybdenum alloy, and the other is a titanium alloy.

And they're used interchangeably.

But they all have a couple of common features that they don't rust out.

They're compatible in a saline solution like the body.

So they're completely inert, and they're not rejected by the body.

The other thing is that a second thing is that they're available at a reasonable cost.

There are elements that can be put into and milled and cast into shapes that are easy to do.

And the third thing is they both can be very highly polished.

They can be polished to a surface that doesn't create

microscopic debris.

And so those are the three metal, three metal alloys.

And there are three reasons or so for metal alloys.

The plastic is also all the same.

You know, it's a, it's a polyethylene plastic.

And now that's been improved over the years, that's changed.

not the basic plastic itself, but it's been reinforced.

The earlier forms of that plastic tended to wear and they created the microscopic debris in the joint over a long time, which caused inflammation in the joint and would cause some of these components to loosen and need to be revised.