▁re appro xim ated ▁across ▁a ▁gap . ▁N erve ▁segments ▁are ▁taken ▁from ▁another ▁part ▁of ▁the ▁body ▁( the ▁don or ▁site ) ▁and ▁inserted ▁into ▁the ▁les ion ▁to ▁provide ▁end one ur ial ▁tub es ▁for ▁ax onal ▁reg ener ation ▁across ▁the ▁gap . ▁However , ▁this ▁is ▁not ▁a ▁perfect ▁treatment ; ▁often ▁the ▁final ▁outcome ▁is ▁only ▁limited ▁function ▁recovery . ▁Also , ▁partial ▁de - inner v ation ▁is ▁frequently ▁experienced ▁at ▁the ▁don or ▁site , ▁and ▁multiple ▁sur ger ies ▁are ▁required ▁to ▁har vest ▁the ▁t issue ▁and ▁impl ant ▁it . ▁ ▁When ▁appropriate , ▁a ▁nearby ▁don or ▁may ▁be ▁used ▁to ▁supply ▁inner v ation ▁to ▁les ioned ▁n erves . ▁Tra uma ▁to ▁the ▁don or ▁can ▁be ▁minim ized ▁by ▁util izing ▁a ▁technique ▁known ▁as ▁end - to - side ▁repair . ▁In ▁this ▁procedure , ▁an ▁ep ine ur ial ▁window ▁is ▁created ▁in ▁the ▁don or ▁n erve ▁and ▁the ▁proxim al ▁st ump ▁of ▁the ▁les ioned ▁n erve ▁is ▁s ut ured ▁over ▁the ▁window . ▁Reg ener ating ▁ax ons ▁are ▁redirect ed ▁into ▁the ▁st ump . ▁E ffic acy ▁of ▁this ▁technique ▁is ▁partially ▁dependent ▁upon ▁the ▁degree ▁of ▁partial ▁ne ure ct omy ▁performed ▁on ▁the ▁don or , ▁with ▁increasing ▁degrees ▁of ▁ne ure ct omy ▁giving ▁rise ▁to ▁increasing ▁ax on ▁reg ener ation ▁within ▁the ▁les ioned ▁n erve , ▁but ▁with ▁the ▁consequence ▁of