this post was submitted on 20 Feb 2026
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Metal will ruin a CT scan. Metal will kill you in an MRI machine.
But that's zinc shot... It doesn't even look like steel. It shouldn't be attracted to a magnet.
https://www.ausrad.com/exams-services/magnetic-resonance-imaging/can-i-have-an-mri-if-i-have-metal-in-my-body/
Isn't that just because they use non-magnetic metals for implants?
Titanium, afaik
And that's zinc shot. Perhaps they're steel inside, but the outside is clearly zinc.
I know it's my name, but I have to congratulate you on the excellent pedantry!
How on earth can you tell the difference between steel and zinc at a glance?
Zinc has a characteristic light bluish tint and oxidizes to white, not yellow or brown. Some of them appear slightly dull and oxidised with a grey or white layer.
And how do you propose to know how blue-tinted those balls are without being able to tell what they're reflecting and what the camera's white balance is set to?
I blurred the image and took a few colour samples; the balls are grey in the image, with very slightly more red in them than green or blue. That doesn't mean they're actually grey; they could be slightly blue and reflecting a slightly red scene or vice versa. They could be slightly green but the camera settings have "corrected" it to look grey.
How can you tell that the "dull" ones are oxidised, as opposed to roughened, blurred due to movement or covered with some other substance like lubricant?
All excellent points! I concede to your deeper consideration. (Though I do think that a "roughened" ball bearing would rather prove my point for me, and that those which appear roughened are largely also those under other balls, lessening the chance that they are moving)
This isn't an implant though. Massive difference.
I soon expect to have screws implanted in my spine. I also have other infirmities. I hope like hell to never have screws ripped through my vertebrae by an MRI.
Implants are non-magnetic. Wrecks the image, though.
Hopefully they don't need to do an MRI of my spine after they operate on it - apparently for their sake, not mine.
I hope you'll recover quick and get rid of your health problems!
Thanks!
Ugh, yeah, how do they even do MRIs for people with metal parts?
I think, as someone else said, things installed into the body are usually titanium and thus non ferrous. Fortunately they don't generally cause issues with MRIs as a result.
(I only know this because when I broke my ankle, during the pre-surgery interview, I asked the surgeon about going through metal scanners at an airport.)
Non ferrous metal.
What are implants made of? Stainless for the most part.
Usually titanium, but yeah sometimes medical stainless steel. Both are non-ferromagnetic, especially titanium. These balls look like they could well be normal steel or any other metal. Also, implants - unlike these metal balls - are usually screwed firmly into your bones. So yeah, implants should be mostly fine on MRI. Loose balls of dubious metal? Wouldn't advise it. Keep in mind MRIs are literally powerful enough that metals in tattoo ink can even be an issue - which the article you linked mentions itself.