if you look at the flesh in the picture, it shows signs of a tearing injury just distal to the elbow. that arm was ripped off. i've seen many injuries like this in the ER usually the result of MVA. as for the arm being viable, if infection doesn't set in and the tissue is not necrotic, the wrist definately and some of the fingers likely will regain enough function justifying the reattachment. however this will most likely take at minimum 3-5 additional procedures. i guess the point of the story is don't hand over your arm to a 400lb croc.