scholarly journals ESTIMATION OF THE OPTIMAL FIBULAR GRAFT ANGLE FOR PROXIMAL HUMERUS FRACTURES USING FINITE ELEMENT ANALYSIS

2020 ◽  
Vol 20 (10) ◽  
pp. 2040029
Author(s):  
JIN WOONG YI ◽  
JONG UN KIM ◽  
HYUN JAE CHA ◽  
JINBOK YI ◽  
KI SIK TAE
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Proximal Humerus Fracture ◽  
Proximal Humerus ◽  
Varus Deformity ◽  
Humerus Fracture ◽  
Fibular Graft ◽  
Element Analysis ◽  
Insertion Angle ◽  
Graft Angle

Proximal humerus fracture is a common injury and is usually treated using an internal fixation. However, clinical studies have reported that such treatments are associated with problems such as varus deformity and screw penetration. Therefore, to solve these problems, a surgical method using fibular allografts (FAs) is recently reported. Thus, this study is aimed to confirm the effective insertion angle ([Formula: see text], [Formula: see text], [Formula: see text], and [Formula: see text]) of the FA. We applied axial and shear loads to finite element models used in our study. Finite element simulations using these models were repeated five times for each fibular insertion angle. We evaluated the construct stiffness, stress distribution on the plate and fibula, and fracture micromotion. Results showed that the method using the FA caused less stress on the plate and provided higher structural stability than the method without using the FA. In particular, the axis perpendicular condition yielded significantly greater construct stiffness and caused less von Mises stresses than the other conditions. In conclusion, the finite element analysis results showed that the FA inserted horizontally was effective in the treatment of proximal humerus fracture with an unstable medial support.

scholarly journals Finite Element Analysis of Insertion Angle of Absorbable Screws for the Fixation of Radial Head Fractures

2020 ◽  
Vol 12 (6) ◽  
pp. 1710-1717
Author(s):  
Guang‐ming Xu ◽  
Zi‐yang Liang ◽  
Wei Li ◽  
Zheng‐zhong Yang ◽  
Zhi‐bin Chen ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Radial Head ◽  
Element Analysis ◽  
Radial Head Fractures ◽  
Insertion Angle

scholarly journals The most stable pinning configurations in transverse supracondylar humerus fracture fixation in children: A novel three-dimensional finite element analysis of a pediatric bone model

2020 ◽  
Author(s):  
Allieu Kamara ◽  
Xianglu Ji ◽  
Chuang Liu ◽  
Tianjing Liu ◽  
Enbo Wang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Preoperative Evaluation ◽  
Humerus Fracture ◽  
Supracondylar Humerus Fracture ◽  
Element Analysis ◽  
Bone Model ◽  
Fractures In Children ◽  
Supracondylar Humerus Fractures ◽  
Flexion Extension

Abstract Background : This study aimed at finding out the effect of exit height of pins, pin trajectory and pin number on the stability of crossed and lateral pinning configurations used in the fixation of extension-type supracondylar humerus fracture (SHF) in children, through finite element analysis of a novel pediatric humerus bone model. Method : Distal humerus model consisting of the ossific nucleus of the capitellum (ONC) and distal cartilage of a 6-year-old boy was developed computationally. Various crossed and lateral pinning fixation models with either two or three pins were simulated on an extension-type, transverse SHF and tested in six loading directions. Results : Two-crossed pins and 2-lateral pins were respectively more stable in rotation and compression loadings, while 3-crossed pins were the most stable in all loading directions. The crossed pins exiting at the upper border of the distal metaphyseal-diaphyseal junction (MDJ) had the best stiffness among the 2-crossed pins, while the lateral pins with a mid-ONC distal pin provided the best stiffness among the 2-lateral pins. A third pin however, going through the olecranon fossa led to improved stability of the 2-lateral pins in flexion, extension, internal and external rotations. Conclusion : In the fixation of extension-type, transverse supracondylar humerus fractures, 2-crossed pins are only superior to 2-divergent lateral pins in rotational loadings. Two-crossed pins exiting at the upper border of the MDJ provides the best stability, whereas 2-lateral pins with a distal pin going through the middle third of the ONC provides the best stability against compression forces for these fractures. Three-crossed pins however offer the best stability against both compression and rotation forces.This study offers important clues in the preoperative evaluation and management of extension-type supracondylar fractures in children.

scholarly journals The most stable pinning configurations in transverse supracondylar humerus fracture fixation in children: A novel three-dimensional finite element analysis of a pediatric bone model

2020 ◽  
Author(s):  
Allieu Kamara ◽  
Xianglu Ji ◽  
Chuang Liu ◽  
Tianjing Liu ◽  
Enbo Wang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Humerus Fracture ◽  
Supracondylar Humerus Fracture ◽  
Element Analysis ◽  
Bone Model ◽  
Fractures In Children ◽  
Supracondylar Humerus Fractures ◽  
Flexion Extension

Abstract Background: This study aimed at finding out the effect of exit height of pins, pin trajectory and pin number on the stability of cross and lateral pinning configurations used in the fixation of extension-type supracondylar humerus fracture (SHF) in children, through finite element analysis of a novel pediatric humerus bone model. Methods: Distal humerus model consisting of the ossific nucleus of the capitellum (ONC) and distal cartilage of a 6-year-old boy was developed via three-dimensional finite modeling. Various cross and lateral pinning fixation models with either two or three pins were simulated on an extension-type, transverse SHF and tested in six loading directions. Results: Two-cross pins and 2-lateral pins were respectively more stable in rotation and compression loadings, while 3-cross pins were the most stable in all loading directions. The cross pins exiting at the upper border of the distal metaphyseal-diaphyseal junction (MDJ) had the best stiffness among the 2-cross pins, while the lateral pins with a mid-ONC distal pin provided the best stiffness among the 2-lateral pins. A third pin however, going through the olecranon fossa led to improved stability of the 2-lateral pins in flexion, extension, internal and external rotations. Conclusion: In the fixation of extension-type, transverse supracondylar humerus fractures, 2-cross pins are only superior to 2-divergent lateral pins in rotational loadings. Two-cross pins exiting at the upper border of the MDJ provides the best stability, whereas 2-lateral pins with a distal pin going through the middle third of the ONC provides the best stability against compression forces for these fractures. Three-cross pins however offer the best stability against both compression and rotation forces. This study offers important clues in the preoperative evaluation and management of extension-type supracondylar fractures in children.

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