章莹(Zhang Ying，Dept Orthop，Guangzhou Gen Hosp Guangzhou Mil Command， Guangzhou， Guangdong 510515)…∥Chin J Clin Basic Orthop Res.－2010，2(2).－98～101

Application of computer aided 3D simulation technique for complicated foot and ankle fractures

章莹(Zhang Ying，Dept Orthop，Guangzhou Gen Hosp Guangzhou Mil Command， Guangzhou， Guangdong 510515)…∥Chin J Clin Basic Orthop Res.－2010，2(2).－98～101

ObjectiveTo investigate the effect of computer aided 3D simulation technique for treating complicated foot and ankle fractures precisely.MethodsFrom November 2007 to August 2009，255 patients with complicated foot and ankle fractures were treated surgically.Among these patients，conventional operations were performed in 123 cases(group 1)，and operations applied with preoperative CT images 3D reconstruction by simulation and individualization were performed in 132 cases(group 2).For 196 patients who had follow-up more than 6 months，an retrospective study was done ation to compare reduction fixation time during the operation and ankle joint functions(according to Hindfoot evaluation system formulated by American foot and ankle surgery association)at 6 months follow-up between both groups.ResultsOne hundred and ninety-six patients were followed up from 6 to 36 months with average 12 months.There were 105 cases in group 2 and 91 cases in group 1.The reduction fixation time was(44.3 ± 5.4)min and(56.3 ± 5.7)min，respectively，for which the difference had statistical significance(t=4.510，P=0.000).At 6 months followup，ankle joint functions of patients in group 2(excellent in 60 cases，good in 35 cases，fair in l0 cases，the excellent and good rate was 90.4%)recovered better than that of those in group I(excellent in 39 cases，good in 32 cases，fair in 14 cases and poor in 6 cases，the excellent and good rate was 78.0%)while there were no statistical difference between two groups(Χ2=1.418，P=0.165).ConclusionComputer aided 3D simulation individualized surgery can be used effectively to reduce reduction fixation time during the operation and can im-prove the surgical accuracy for complicated foot and ankle fractures.14 refs，2 figs.

(Authors)