Severed limbs should not be submerged in ice water because it will further the damage to the limb's tissue. The larger the limb, the easier the reattachment operation. This is usually the case dependent on the severity of damage, because the nerves and vessels are larger and are not as delicate as smaller regions of the body. Accident victims should request the aid of a certified plastic surgeon when surgery is required. This will insure that the work performed is as beneficial as possible.
Plastic surgeons are very precise.