▁front ▁disc ▁bra ke ▁and ▁rear ▁drum ▁bra ke ▁and ▁a ▁fuel ▁capacity ▁of ▁. ▁ ▁External ▁links ▁ ▁Official ▁Website ▁ ▁Category : M ot or ▁sc oot ers ▁Category : M op eds ▁Category : Two - stroke ▁motor cy cles ▁Category : T ai wan ese ▁motor cy cles <0x0A> </s> ▁The ▁Kru ken berg ▁procedure , ▁also ▁known ▁as ▁the ▁Kru ken berg ▁operation , ▁is ▁a ▁surg ical ▁technique ▁that ▁converts ▁a ▁for ear m ▁st ump ▁into ▁a ▁pin cer . ▁It ▁was ▁first ▁described ▁in ▁ 1 9 1 7 ▁by ▁the ▁German ▁army ▁sur geon ▁Hermann ▁Kru ken berg . ▁It ▁remains ▁in ▁use ▁today ▁for ▁certain ▁special ▁cases ▁but ▁is ▁considered ▁controvers ial ▁and ▁some ▁sur ge ons ▁refuse ▁to ▁perform ▁it .</ blockquote > ▁ ▁Pro cedure ▁ ▁The ▁procedure ▁involves ▁separ ating ▁the ▁ul na ▁and ▁radius ▁for ▁below - el bow ▁am put ations , ▁and ▁in ▁cases ▁of ▁con gen ital ▁absence ▁of ▁the ▁hand , ▁to ▁provide ▁a ▁pin cer like ▁grasp ▁that ▁is ▁mot ored ▁by ▁the ▁pron ator ▁ter es ▁mus cle . ▁ ▁The ▁pr ere quis ites ▁for ▁the ▁operation ▁are ▁a ▁st ump ▁over ▁ 1 0   cm ▁long ▁from ▁the ▁tip ▁of ▁the ▁o le c ran on , ▁no ▁el bow ▁contract ure , ▁and ▁good ▁psych ological ▁prepar ation ▁and ▁accept ance . ▁▁▁▁ ▁The ▁success ▁of ▁the ▁Kru ken berg ▁procedure ▁depends ▁directly ▁on ▁the ▁strength ▁of ▁the ▁pron