کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8598810 | 1565430 | 2017 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Análise de elementos finitos da distribuição de tensões equivalentes nos pinos de Schanz durante o uso do distrator femoral de fraturas
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کلمات کلیدی
Fixadores externos - اتصال دهنده های خارجیExternal fixators - ثابت کننده خارجیFinite element analysis - روش اجزاء محدودFemoral fractures - شکستگی فمورالFraturas do fêmur - شکستگی های رانbone nails - ناخن استخوانTreatment outcome - نتیجه درمانResultado do tratamento - نتیجه درمانPinos ortopédicos - پین های ارتوپدی
موضوعات مرتبط
علوم پزشکی و سلامت
پرستاری و مشاغل بهداشتی
درمان فیزیکی و توانبخشی
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
An analysis of 3Â D finite elements was performed to evaluate the distribution of the equivalent stress (triple stress state) in a Schanz screw fixed bicortically and orthogonally to a tubular bone, using two mounting patterns: (1) thread/shaft transition located 20Â mm from the anchorage of the Schanz screws in the entrance to the bone cortex and (2) thread/shaft transition located 3Â mm from the anchorage of the Schanz screws in entrance to the bone cortex. The simulations were performed maintaining the same direction of loading and the same distance from the force vector in relation to the center of the hypothetical bone. The load applied, its direction, and the distance to the center of the bone were constant during the simulations in order to maintain the moment of flexion equally constant. The present calculations demonstrated linear behavior during the experiment. It was found that the model with a distance of 20Â mm between the Schanz screws anchorage in the entrance to the bone cortex and the thread/shaft transition reduces the risk of breakage or fatigue of the material during the application of constant static loads; in this model. the maximum forces observed were higher (350Â Mpa). The distance between the Schanz screws anchorage at the entrance to the bone cortex and the smooth thread/shaft transition of the screws used in a femoral distractor during acute distraction of a fracture must be farther from the entrance to the bone cortex, allowing greater degree of elastic deformation of the material, lower mechanical stress in the thread/shaft transition, and minimized breakage or fatigue. The suggested distance is 20Â mm.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Revista Brasileira de Ortopedia - Volume 52, Issue 4, JulyâAugust 2017, Pages 396-401
Journal: Revista Brasileira de Ortopedia - Volume 52, Issue 4, JulyâAugust 2017, Pages 396-401
نویسندگان
Vincenzo Giordano, Alexandre Leme GodoyâSantos, William Dias Belangero, Robinson Esteves Santos Pires, Pedro José Labronici, Hilton Augusto Koch,