Severed extremity by avulsion type injury doesn't constitute good indication for replantation by any means and used to end up with total failure even if tried by efficient microsurgical team. The main cause of difficulties met with in this kind of situation is that the extent of tissue injury is usually hard to define even under microscopic control being far beyond imaginable. The authors have experienced three cases of avulsed upper extremity by industrial injury which were treated successfully with microsurgical replantation. Their results are found generally good at nine months to 1 year postoperative follow-up on terms of survival rate, function and appearance. The clinical analysis upon these cases is to be presented with review of references.