|کد مقاله||کد نشریه||سال انتشار||مقاله انگلیسی||ترجمه فارسی||نسخه تمام متن|
|5652518||1407218||2017||8 صفحه PDF||سفارش دهید||دانلود کنید|
PurposeAppropriate fixation method for the posterior malleolar fractures (PMF) according to the fracture size is still not clear. Aim of this study was to evaluate the outcomes of the different fixation methods used for fixation of PMF by finite element analysis (FEA) and to compare the effect of fixation constructs on the size of the fracture computationally.Materials and methodsThree dimensional model of the tibia was reconstructed from computed tomography (CT) images. PMF of 30%, 40% and 50% fragment sizes were simulated through computational processing. Two antero-posterior (AP) lag screws, two postero-anterior (PA) lag screws and posterior buttress plate were analysed for three different fracture volumes. The simulated loads of 350Â N and 700Â N were applied to the proximal tibial end. Models were fixed distally in all degrees of freedom.ResultsIn single limb standing condition, the posterior plate group produced the lowest relative displacement (RD) among all the groups (0.01, 0.03 and 0.06Â mm). Further nodal analysis of the highest RD fracture group showed a higher mean displacement of 4.77Â mm and 4.23Â mm in AP and PA lag screws model (pÂ =Â 0.000). The amounts of stress subjected to these implants, 134.36Â MPa and 140.75Â MPa were also significantly lower (pÂ =Â 0.000). There was a negative correlation (pÂ =Â 0.021) between implant stress and the displacement which signifies a less stable fixation using AP and PA lag screws.ConclusionProgressively increasing fracture size demands more stable fixation construct because RD increases significantly. Posterior buttress plate produces superior stability and lowest RD in PMF models irrespective of the fragment size.
Journal: Injury - Volume 48, Issue 4, April 2017, Pages 825-832