scholarly journals Engineering Judgment of Children Bone Fracture

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
A. Alsamhan ◽  
M. M. ELSingergy ◽  
M. M. Zamzam ◽  
S. M. Darwish
Keyword(s):  
Finite Element ◽  
Bone Fracture ◽  
Humerus Fracture ◽  
Supracondylar Humerus Fracture ◽  
Finite Element Technique ◽  
Fractures In Children ◽  
Elbow Fractures ◽  
Wire Fixation ◽  
Element Technique

Supracondylar humerus fracture (SCHF) is one of the commonest elbow fractures in children. It is common injury for children with age from four to fourteen. In current study, the finite element technique is used to evaluate two techniques, namely, parallel and crossed K-wire fixation for treatment of SCHF, using K-wire fixation.

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.

A Study of Wall Ironing by the Finite Element Technique

1978 ◽  
Vol 100 (1) ◽  
pp. 31-36 ◽  
Author(s):  
E. I. Odell
Keyword(s):  
Finite Element ◽  
Lower Bound ◽  
Cone Angle ◽  
Reduction Ratio ◽  
Operating Parameters ◽  
Finite Element Technique ◽  
Elastic Plastic ◽  
Maximum Reduction ◽  
Load Displacement ◽  
Element Technique

Wall ironing has been analyzed using an elastic-plastic finite element technique. The effects that the ironing ring semi-cone angle and friction have on the maximum reduction ratio are studied in detail. Stress contours are given for a typical set of operating parameters. Several ram load/displacement curves are provided and compared with upper and lower bound loads.

The Effect of Initial Forces on the Hydroelastic Vibration and Stability of Planar Curved Tubes

1974 ◽  
Vol 41 (2) ◽  
pp. 355-359 ◽  
Author(s):  
J. L. Hill ◽  
C. G. Davis
Keyword(s):  
Finite Element ◽  
Internal Pressure ◽  
Constant Curvature ◽  
Elastic Limit ◽  
Center Line ◽  
Finite Element Technique ◽  
Line Shapes ◽  
Circular Arcs ◽  
Out Of Plane ◽  
Element Technique

The effect of initial forces on the vibration and stability of curved, clamped, fluid conveying tubes is analyzed by the finite-element technique. The tubes are initially planar with general center-line shapes approximated by constant curvature arcs. The effect of internal pressure is included. Numerical results are presented with, and without, the effects of the initial in-plane forces, for circular arcs S, L, and spiral configurations. Neglecting initial forces results in out-of-plane buckling, while including these forces prevents buckling within the elastic limit, in all configurations studied.

scholarly journals A Rare Case of Pseudoaneurysm of the Brachial Artery in Supracondylar Humerus Fracture

2021 ◽  
Vol 11 (6) ◽  
Author(s):  
Shrihari L Kulkarni ◽  
Manjunath S Daragad ◽  
Sunil Mannual ◽  
Yashwanth Krishna
Keyword(s):  
Brachial Artery ◽  
Rare Case ◽  
Saphenous Vein Graft ◽  
Vascular Complications ◽  
Humerus Fracture ◽  
Type I ◽  
Supracondylar Humerus Fracture ◽  
Fractures In Children ◽  
Pulsatile Mass ◽  
Supracondylar Humerus Fractures

Introduction: Supracondylar humerus fractures are very common fractures in children. About 10–14% are associated with vascular complications. We report a rare case of pseudoaneurysm of the brachial artery which was promptly detected in a well-perfused hand nearly 2 weeks after reduction and fixation. Case Report: A 10-year-old girl with Type I open supracondylar fracture of the left humerus (Modified Gartland Type 2) presented 2 weeks post-fixation with pulsatile mass in the elbow. Imaging revealed a pseudoaneurysm of brachial artery which was managed by excision and reconstruction using great saphenous vein graft. The fracture united uneventfully and the child made a full return to pre-fracture level of activity. Conclusion: The case highlights the occurrence of pseudoaneurysm of brachial artery, a rare complication seen few days or weeks after the injury, which coincides with the post-operative period in children managed by surgical fixation. This emphasizes the need for periodic monitoring of the neurovascular status of the children even after successful reduction and fixation. Keywords: Supracondylar humerus fracture, vascular complication, pseudoaneurysm.

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