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 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 ◽  
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 The morphological mapping of lateral compression type 1 pelvic fracture and pelvic ring stability classification: a finite element analysis

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Bin-Fei Zhang ◽  
Jun Wang ◽  
Yu-Min Zhang ◽  
Hui-Guang Cheng ◽  
Qian-Yue Cheng ◽  
...  
Keyword(s):  
Machine Learning ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Pelvic Ring ◽  
Von Mises Stress ◽  
Lateral Compression ◽  
Element Analysis ◽  
Pubic Ramus ◽  
Maximum Deformation ◽  
Ring Stability

Abstract Purpose This finite element analysis assessed lateral compression (LC-1) fracture stability using machine learning for morphological mapping and classification of pelvic ring stability. Methods Computed tomography (CT) files of LC-1 pelvic fractures were collected. After morphological mapping and producing matrix data, we used K-means clustering in unsupervised machine learning to classify the fractures. Based on these subtypes, we manually added fracture lines in ANSYS software. Finally, we performed a finite element analysis of a normal pelvis and eight fracture subtypes based on von Mises stress and total deformation changes. Results A total of 218 consecutive cases were analyzed. According to the three main factors—zone of sacral injury and completion, pubic ramus injury side, and the sagittal rotation of the injured hemipelvis—the LC-1 injuries were classified into eight subtypes (I–VIII). No significant differences in stress or deformation were observed between unilateral and bilateral public ramus fractures. Subtypes VI and VIII showed the maximum stress while subtypes V–VIII showed the maximum deformation in the total pelvis and sacrum. The subtypes did not differ in superior public ramus deformation. Conclusions Complete fracture of sacrum zones 2/3 may be a feature of unstable LC-1 fractures. Surgeons should give surgical strategies for subtypes V–VIII.

scholarly journals Finite Element Analysis of Stress Distribution in Normal and Osteoporosis Pelvis Models

2019 ◽  
Vol 56 (4) ◽  
pp. 840-844 ◽  
Author(s):  
Bogdan Veliceasa ◽  
Ovidiu Alexa ◽  
Paul Dan Sirbu ◽  
Alexandru Filip ◽  
Edward Rakosi ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Maximum Stress ◽  
Pelvic Ring ◽  
Osteoporotic Bone ◽  
Posterior Arch ◽  
Element Analysis ◽  
Obturator Foramen ◽  
Common Understanding

Finite element analysis is the most commonly used methods in orthopedic biomechanical research. The study aims at improving the common understanding of the behavior of the pelvis and the biomechanics of the pelvic ring in a healthy and osteoporosis configuration. We performed a finite element analysis using the ANSYS program. The study mainly focused on bones and the joints and the complex modelling of the ligaments was ignored. The results of our study showed that the stress distribution of the pelvis with osteoporosis was changed compared with normal pelvis. In addition to, in the healthy bone, where the maximum stress values are concentrated around the obturator foramen (anterior arch of the pelvic ring), in the osteoporotic bone, the maximum stress also appear at the posterior arch of the pelvic ring (especially in the sacrum.

scholarly journals Finite Element Analysis of Different Percutaneous Fixation Strategies Used for the Treatment of Tile C1.2 Pelvic Fracture

2020 ◽  
Author(s):  
changqing Xu ◽  
wanbo Zhu ◽  
lei Liu ◽  
jiazhao Yang ◽  
shiyuan Fang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Pelvic Fracture ◽  
Pelvic Ring ◽  
Strong Stability ◽  
Von Mises Stress ◽  
Percutaneous Fixation ◽  
Element Analysis ◽  
Sacroiliac Screw ◽  
Software Models

Abstract Objectives We evaluated the biomechanical outcomes of 9 different percutaneous fixation strategies used for the fixation of Tile C1.2 pelvic fracture. This may help surgeons choose the optimal therapy for the unstable pelvic fracture. Methods Tile C1.2 pelvic fractures and implant models were constructed using finite element analysis (FEA) software. Models were assembled for different fracture fixation types. After meshing the models’ elements, we used Abaqus software to perform the FEA. Values of the von Mises Stress and model displacement were used to capture the mechanical factors. Results The FEA shows that under axial loading and external rotational loading of 500 N, the combination of an S1 screw and the Infix system provide strong stability, and that an increased number of screws to fix the anterior pelvic ring increased stability. Conclusion This study indicates that a 3-screw-Infix system on the healthy side, plus an S1 sacroiliac screw improves stability of the Tile C1.2 fracture.

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