There are a lot of answers in here that are completely missing what I would consider to be the most important point.
If you’re going to amputate a limb on a live patient, and you want them to stay that way (alive, I mean), then you need to save enough skin to close the wound once you’re finished or the patient will almost certainly die from the resulting infection. If you just chop a limb off like a butcher, that leaves you with no skin to cover the wound. The cuts must be made in a manner that leaves you with flaps of skin and other tissue that are much longer than the remaining bone which can then be sutured closed to give the patient a closed barrier against infection and a real chance of *not* dying from sepsis.
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