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They can grow together but will take longer than a week. There's a man the had his hand degloved and they sewed it into his stomach to heal, after which they cut his hand back out and used his stomach skin to wrap around and reshape some resemblance of a hand.

Example 1: https://www.thesun.co.uk/news/4303135/surgeons-save-hand-sew...

Example 2: https://www.menshealth.com/health/a19517212/carlos-mariotti-...

Wow. Can you imagine how that would feel, to have your hand inside of you? I'd worry about accidentally breaking something inside me. Amazing though.

This is the origin of the concept of a skin graft, surely.

That's how it works basically yes.

https://www.royalfree.nhs.uk/services/services-a-z/plastic-s...

Try it and let us know!