I can't really help with the medical side of this except to say that my father's replacement knee was made of titanium.
As far as stainless steel goes, then generally is pretty much non-magnetic. Steel is iron with other things added to give the strength and durability, usually carbon.
To make this steel 'stainless' they add chromium - at least 11.5% and often twice that amount, or more. This makes it stainless because the iron rusts and wears off leaving the chrome. Obviously the chrome just by itself reduces the magnetivity of the steel, but in this form it is still magneticly attractable.
Your problem comes when they added nickel to it as it alters the structure and makes it non-magnetic unless it has been work-hardened i.e. hit with a hammer. Adding nickel makes it easier to work with, and less brittle, and less likely to corrode, so I would imagine - but I don't know - that for medical uses this is what they would use.
Unfortunately for your story, the most likely materials used to construct a replacement skeleton would be titanium and carbon fibre and probably other more modern, more interesting materials, but none of them would be magnetic. Mind you, if you want to get him stuck to a magnet, then you could always put him between the magnet and a filing cabinet.
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