How do you tell an alien about the stuff we attach to our skeletons as a way of not letting a trauma fuck our bodies up? I mean, have you ever seen a Fixateure externe? We bolt an external metal structure to an already damaged bone (
and the other bones that need it for stability in the joint) so it’s at the correct lenght for mending itself without the boneends moving accidentally too far away and forming a pseudarthrosis.
Because you better believe our bodies will do that if left alone. It renders the bodypart effing useless.
Also, we sometimes just stick a titanium rod through hollow bones to fix them. Not getting in detail, but just imagine.
You are at the spaceport, and suddenly something weird shows up on one of the monitors. In a human body, so the possibility of the readings being accurate just went from no-way to oh-my-gosh-what’s-it-again. Anyway, you make your way to the waiting terran spacers. Ask if they are aware of there being a rather severe and concentrated metal-deposit in their… shoulder bone, clavicle your computer tells you it’s called.
You see the moment they understand, and most just start snickering and the affected human just starts… cursing… ‘alien airport detectors’.
They show you the medical papers shortly after that. You stare at them, turn your translator off and on again (a habit you picked up from a human acquaintance, actually…), then decide not to bother them anymore. You make a note of it and send it to your superior to do as they please. Because no. Protesis, even endoprotesis you can understand, but those are state-of-art medical devices.
Not a piece of titanium in the bonemarrow.