Biomechanical analysis for five fixation techniques of Pauwels-III fracture by finite element modeling

2020 ◽  
Vol 193 ◽  
pp. 105491 ◽  
Author(s):  
Matthew Jian-Qiao Peng ◽  
HongWen Xu ◽  
Hai-Yan Chen ◽  
Ze Lin ◽  
XinXu Li ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Biomechanical Analysis ◽  
Element Modeling ◽  
Fixation Techniques

Finite Element Modeling of Resurfacing Hip Prosthesis: Estimation of Accuracy Through Experimental Validation

2010 ◽  
Vol 132 (2) ◽  
Author(s):  
Fulvia Taddei ◽  
Saulo Martelli ◽  
Harinderjit Singh Gill ◽  
Luca Cristofolini ◽  
Marco Viceconti
Keyword(s):  
Finite Element ◽  
Femoral Neck ◽  
Finite Element Modeling ◽  
Hip Joint ◽  
Numerical Study ◽  
Biomechanical Analysis ◽  
Implantation Technique ◽  
Element Modeling ◽  
Numerical Predictions ◽  
Satisfactory Outcome

Metal-on-metal hip resurfacing is becoming increasingly popular, and a number of new devices have been recently introduced that, in the short term, appear to have satisfactory outcome but many questions are still open on the biomechanics of the resurfaced femur. This could be investigated by means of finite element analysis, but, in order to be effective in discerning potential critical conditions, the accuracy of the models’ predictions should be assessed. The major goal of this study was to validate, through a combined experimental-numerical study, a finite element modeling procedure for the simulation of resurfaced femurs. In addition, a preliminary biomechanical analysis of the changes induced in the femoral neck biomechanics by the presence of the device was performed, under a physiologic range of hip joint reaction directions. For this purpose, in vitro tests and a finite element model based on the same specimen were developed using a cadaver femur. The study focused on the Conserve Plus, one of the most common contemporary resurfacing designs. Five loading configurations were identified to correspond to the extremes of physiological directions for the hip joint. The agreement between experimental measurements and numerical predictions was good both in the prediction of the femoral strains (R2>0.9), and in the prosthesis micromotions (error<20 μm), giving confidence in the model predictions. The preliminary biomechanical analysis indicated that the strains in the femoral neck are moderately affected by the presence of the prosthesis, apart from localized strain increments that can be considerable, always predicted near the stem. Low micromotions and contact pressure were predicted, suggesting a good stability of the prosthesis. The model accuracy was good in the prediction of the femoral strains and moderately good in the prediction of the bone-prosthesis micromovements. Although the investigated loading conditions were not completely physiological, the preliminary biomechanical analysis showed relatively small changes for the proximal femur after implantation. This validated model can support realistic simulations to examine physiological load configurations and the effects of variations in prosthesis design and implantation technique.

scholarly journals Techniques for Final Pelvic Ring Fixation Based on the Method of Finite Element Modeling

2014 ◽  
Vol 21 (1) ◽  
pp. 38-44
Author(s):  
S. V Donchenko ◽  
V. E Dubrov ◽  
A. V Golubyatnikov ◽  
A. V Chernyaev ◽  
I. A Kuz’kin ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Pelvic Ring ◽  
Weight Bearing ◽  
Full Weight Bearing ◽  
Posterior Pelvic Ring ◽  
Element Modeling ◽  
Study Results ◽  
Sacroiliac Screws ◽  
Fixation Techniques

Method of finite element modeling was used for mathematic modeling of pelvic fractures and various variants of anterior and posterior pelvic ring fixation with reconstructive plates, cannu- lated sacroiliac screws and pelvic screws. Four most common types of fracture were simulated. Stress-deformed conditions of metal constructions for every type of fracture and variant of its fixation were determined. Study results enabled to determine the optimum fixation techniques in various types of fractures, to confirm the significance of both anterior and posterior pelvic stabilization, as well as to substantiate the possibility of early rehabilitation with full weight bearing in such severe patients

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