Amputation seems like merely hacking a limb off, but it is much more difficult. The surgeon must decide the length of the bone by deciding what is healthy and if there is enough tissue to cover the wound. The cut muscles are tied to either one another, to the end of the bone, or to the bone itself.
Any tissue that is not needed is cut off, but there are special rules for cutting neurons. Since severed nerves can be sensitive to pressure, nerves must be cut where they won't be touching the prosthesis.
Surgeons must be weary of creating skin grafts cannot stand the force of the stump.