scholarly journals Modified pedicle screw-rod versus anterior subcutaneous internal pelvic fixation for unstable pelvic anterior ring fracture: A retrospective study and finite element analysis

2020 ◽  
Author(s):  
Sheng-Long Ding ◽  
Fan-Cheng Chen ◽  
Jun-Ming Huang ◽  
Guang-Ming Zhang ◽  
Fu-Yong Wang ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Pedicle Screw ◽  
Lower Risk ◽  
Pelvic Ring ◽  
Element Analysis ◽  
Pelvic Fixation ◽  
Pelvic Ring Fractures ◽  
Fixation Stability ◽  
Anterior Ring

Abstract Objectives: This study compared the stability and clinical outcomes of modified pedicle screw-rod fixation (MPSRF) and anterior subcutaneous internal pelvic fixation (INFIX) for the treatment of anterior pelvic ring fractures. Methods: In a retrospective review of a consecutive patient series conducted in a level 1 trauma university hospital, 63 patients with Orthopaedic Trauma Association (OTA)/Arbeitsgemeinschaft für Osteosynthesefragen (AO) type B or C pelvic ring fractures were treated by MPRSF (n=30) or INFIX (n=33). The mean follow-up was 20 months. The main outcome measure was the incidence of complications and adverse outcomes, and fixation stability was evaluated by finite element analysis (FEA). Results: The 2 groups did not differ in terms of injury severity score, OTA classification, cause of injury, and time to pelvic surgery (P>0.05). However, the MPSRF group had a higher satisfactory rate according to the Tornetta and Matta grading system than the INFIX group (73.33% vs 63.63%) as well as a higher Majeed score (81.5±10.4 vs 76.3±11.2), which was statistically significant at 6 months’ post-surgery (P<0.001). FEA showed that MPRSF was stiffer and more stable than INFIX and had a lower risk of implant failure. Conclusions: Both MPSRF and INFIX have acceptable biomechanical stability for the treatment of unstable pelvic anterior ring fractures. However, MPRSF has better fixation stability and lower risk of implant failure, which can lead to better clinical outcomes.

scholarly journals Modified pedicle screw-rod versus anterior subcutaneous internal pelvic fixation for unstable anterior pelvic ring fracture: a retrospective study and finite element analysis

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Zhi-Hong Pan ◽  
Fan-Cheng Chen ◽  
Jun-Ming Huang ◽  
Cheng-Yi Sun ◽  
Sheng-Long Ding
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Pedicle Screw ◽  
Lower Risk ◽  
Pelvic Ring ◽  
Grading System ◽  
Element Analysis ◽  
Pelvic Fixation ◽  
Pelvic Ring Fractures ◽  
Fixation Stability

Abstract Objectives This study compared the stability and clinical outcomes of modified pedicle screw-rod fixation (MPSRF) and anterior subcutaneous internal pelvic fixation (INFIX) for the treatment of anterior pelvic ring fractures using the Tornetta and Matta grading system and finite element analyses (FEA). Methods In a retrospective review of a consecutive patient series, 63 patients with Orthopaedic Trauma Association (OTA)/Arbeitsgemeinschaft für Osteosynthesefragen (AO) type B or C pelvic ring fractures were treated by MPRSF (n = 30) or INFIX (n = 33). The main outcome measures were the Majeed score, incidence of complications, and adverse outcomes, and fixation stability as evaluated by finite element analysis. Results Sixty-three patients were included in the study, with an average age of 34.4 and 36.2 in modified group and conventional group, respectively. Two groups did not differ in terms of the injury severity score, OTA classification, cause of injury, and time to pelvic surgery. However, the MPSRF group had a rate of higher satisfactory results according to the Tornetta and Matta grading system than the conventional group (73.33% vs 63.63%) as well as a higher Majeed score (81.5 ± 10.4 vs 76.3 ± 11.2), and these differences were statistically significant at 6 months post-surgery. FEA showed that MPSRF was stiffer and more stable than INFIX and had a lower risk of implant failure. Conclusions Both MPSRF and INFIX provide acceptable biomechanical stability for the treatment of unstable anterior pelvic ring fractures. However, MPSRF provides better fixation stability and a lower risk of implant failure, and can thus lead to better clinical outcomes. Therefore, MPSRF should be more widely applied to anterior pelvic ring fractures

scholarly journals Modified pedicle screw-rod versus anterior subcutaneous internal pelvic fixation for unstable pelvic anterior ring fracture: A retrospective study and finite element analysis

2020 ◽  
Author(s):  
Sheng-Long Ding ◽  
Fan-Cheng Chen ◽  
Jun-Ming Huang ◽  
Guang-Ming Zhang ◽  
Fu-Yong Wang ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Lower Risk ◽  
Pelvic Ring ◽  
Grading System ◽  
Element Analysis ◽  
Pelvic Fixation ◽  
Pelvic Ring Fractures ◽  
Fixation Stability ◽  
Anterior Ring

Abstract Objectives: This study compared the stability and clinical outcomes of modified pedicle screw-rod fixation (MPSRF) and anterior subcutaneous internal pelvic fixation (INFIX) for the treatment of anterior pelvic ring fractures using Tornetta and Matta grading system and finite element analyses.Methods: In a retrospective review of a consecutive patient series, 63 patients with Orthopaedic Trauma Association (OTA)/Arbeitsgemeinschaft für Osteosynthesefragen (AO) type B or C pelvic ring fractures were treated by MPRSF (n=30) or INFIX (n=33). The main outcome measure were Majeed score, incidence of complications and adverse outcomes, and fixation stability was evaluated by finite element analysis (FEA).Results: two groups did not differ in terms of injury severity score, OTA classification, cause of injury, and time to pelvic surgery. However, the MPSRF group had a higher satisfactory rate according to the Tornetta and Matta grading system than the INFIX group (73.33% vs 63.63%) as well as a higher Majeed score (81.5±10.4 vs 76.3±11.2), which was statistically significant at 6 months’ post-surgery. FEA showed that MPRSF was stiffer and more stable than INFIX and had a lower risk of implant failure.Conclusions: Both MPSRF and INFIX have acceptable biomechanical stability for the treatment of unstable pelvic anterior ring fractures. However, MPRSF has better fixation stability and lower risk of implant failure, which can lead to better clinical outcomes.

scholarly journals Finite Element Analysis of Horizontal Screw-Screw Crosslink Used in C1-C2 Pedicle Screw-Rod Fixation

2021 ◽  
Vol 27 ◽  
Author(s):  
Beiping Ouyang ◽  
Xiaobao Zou ◽  
Chunshan Luo ◽  
Tingsheng Lu ◽  
Hong Xia ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Pedicle Screw ◽  
Element Analysis ◽  
C2 Pedicle Screw

scholarly journals Treatment of Thoracolumbar Fractures Through Different Short Segment Pedicle Screw Fixation Techniques: A Finite Element Analysis

2020 ◽  
Vol 12 (2) ◽  
pp. 601-608
Author(s):  
Tie‐nan Wang ◽  
Bao‐lin Wu ◽  
Rui‐meng Duan ◽  
Ya‐shuai Yuan ◽  
Ming‐jia Qu ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Pedicle Screw ◽  
Screw Fixation ◽  
Pedicle Screw Fixation ◽  
Thoracolumbar Fractures ◽  
Short Segment ◽  
Element Analysis ◽  
Fixation Techniques

The Benefits of Cement Augmentation of Pedicle Screw Fixation Are Increased in Osteoporotic Bone: A Finite Element Analysis

2014 ◽  
Vol 2 (4) ◽  
pp. 248-259 ◽  
Author(s):  
Wenhai Wang ◽  
George R. Baran ◽  
Hitesh Garg ◽  
Randal R. Betz ◽  
Missoum Moumene ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Pedicle Screw ◽  
Screw Fixation ◽  
Pedicle Screw Fixation ◽  
Cement Augmentation ◽  
Osteoporotic Bone ◽  
Element Analysis

scholarly journals Development of a Computer-Aided Design and Finite Element Analysis Combined Method for Affordable Spine Surgical Navigation With 3D-Printed Customized Template

2021 ◽  
Vol 7 ◽  
Author(s):  
Peter Endre Eltes ◽  
Marton Bartos ◽  
Benjamin Hajnal ◽  
Agoston Jakab Pokorni ◽  
Laszlo Kiss ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
3D Printing ◽  
Surgical Technique ◽  
Pedicle Screw ◽  
Physical Model ◽  
Investment Casting ◽  
Surgical Navigation ◽  
Patient Specific ◽  
Element Analysis

Introduction: Revision surgery of a previous lumbosacral non-union is highly challenging, especially in case of complications, such as a broken screw at the first sacral level (S1). Here, we propose the implementation of a new method based on the CT scan of a clinical case using 3D reconstruction, combined with finite element analysis (FEA), computer-assisted design (CAD), and 3D-printing technology to provide accurate surgical navigation to aid the surgeon in performing the optimal surgical technique by inserting a pedicle screw at the S1 level.Materials and Methods: A step-by-step approach was developed and performed as follows: (1) Quantitative CT based patient-specific FE model of the sacrum was created. (2) The CAD model of the pedicle screw was inserted into the sacrum model in a bicortical convergent and a monocortical divergent position, by overcoming the geometrical difficulty caused by the broken screw. (3) Static FEAs (Abaqus, Dassault Systemes) were performed using 500 N tensile load applied to the screw head. (4) A template with two screw guiding structures for the sacrum was designed and manufactured using CAD design and 3D-printing technologies, and investment casting. (5) The proposed surgical technique was performed on the patient-specific physical model created with the FDM printing technology. The patient-specific model was CT scanned and a comparison with the virtual plan was performed to evaluate the template accuracyResults: FEA results proved that the modified bicortical convergent insertion is stiffer (6,617.23 N/mm) compared to monocortical divergent placement (2,989.07 N/mm). The final template was created via investment casting from cobalt-chrome. The template design concept was shown to be accurate (grade A, Gertzbein-Robbins scale) based on the comparison of the simulated surgery using the patient-specific physical model and the 3D virtual surgical plan.Conclusion: Compared to the conventional surgical navigation techniques, the presented method allows the consideration of the patient-specific biomechanical parameters; is more affordable, and the intraoperative X-ray exposure can be reduced. This new patient- and condition-specific approach may be widely used in revision spine surgeries or in challenging primary cases after its further clinical validation.

Finite Element Analysis Of Pedicle Screw Pullout Strength In Traditional And Cortical Bone Trajectories

2018 ◽  
Author(s):  
Filipe Bisinella da Silva ◽  
Carlos Alberto Costa ◽  
Paulo Roberto Linzmaier ◽  
Asdrubal Falavigna
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Cortical Bone ◽  
Pedicle Screw ◽  
Pullout Strength ◽  
Element Analysis
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