The purpose of the study is to elucidate the different proteins that may appear on the "injured" end of the sciatic nerve and compare it to the other end of the cut nerve, which is "uninjured". By comparing the "normal" versus "traumatized" ends of the cut sciatic nerve, the investigators hope to identify proteins that may be specifically related to pain. For instance, if the non-traumatized end of the nerve has none of Protein X but the traumatized end of the nerve has a lot of Protein X, then Protein X would be a protein that the investigators will want to study further and see if it plays any role in the sensation of pain.