FE analysis of stress and displacements occurring in the bony chain of leg

Filardi, V.

doi:10.1016/j.jor.2014.08.008

Cited by 20 publications

(12 citation statements)

References 24 publications

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“…Within the fixation system, high stresses and fatigue can lead to its technical failure. Compression, bending, and torsional tests have been performed to compare the stiffness and fatigue behavior of various interlocking nails, 8 or implanted nails,. 9 Beside variations in mechanical conditions, a number of additional factors might have contributed significantly to the reported clinical outcome.…”

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confidence: 99%

Healing of tibial comminuted fractures by the meaning of an innovative intramedullary nail

Filardi

2019

Journal of Orthopaedics

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In this paper, an innovative design of prosthesis, conceived to heal the comminuted fractures of long bones has been investigated. The proposed prosthesis consists of two shell valves hinged to each other by a central pin and bearing slits along the surface in such a way as to guarantee the exchange of body fluids and at the same time ensure the structural stability of the bone. Two screws then hold the two valves together. The operative technique for the introduction of this type of prosthesis for the decomposed fracture of long bones consists in the incision of the fracture site, introduction of the open shell prosthesis with reduction of the fracture and composition of the bone fragments, closure by means of fixing screws of the prosthesis shell, stitching open wound flaps. A complete numerical FE model of an implanted femur was analyzed, by considering a vertical load of 980 N. Analyses confirmed results, in terms of mechanical performances, comparable with the others traditional systems of prosthesis.

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confidence: 99%

Healing of tibial comminuted fractures by the meaning of an innovative intramedullary nail

Filardi

2019

Journal of Orthopaedics

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“…The linear elastic analyses were performed by applying loads to the vertebral components and fixing the condilar area of the femur. 10,11 In Table 3 are reported results in terms of global displacement, equivalent elastic strain, normal force, shear force, moment, and equivalent von mises stress referred to the complete six models and to the single parts of it. As it can be argued results confirm higher solicitations obtained varying configurations from case I to case VI.…”

Section: Resultsmentioning

confidence: 99%

Finite element analysis of sagittal balance in different morphotype: Forces and resulting strain in pelvis and spine

Filardi

Portaro

Cacciola

et al. 2017

Journal of Orthopaedics

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In humans, vertical posture acquisition caused several changes in bones and muscles which can be assumed as verticalization. Pelvis, femur, and vertebral column gain an extension position which decreases muscular work by paravertebral muscles in the latter. It's widely known that six different morphological categories exist; each category differs from the others by pelvic parameters and vertebral column curvatures. Both values depend on the Pelvic Incidence, calculated as the angle between the axes passing through the rotation centre of the two femur heads and the vertical axis passing through the superior plate of the sacrum. The aim of this study is to evaluate the distribution of stress and the resulting strain along the axial skeleton using finite element analysis. The use of this computational method allows performing different analyses investigating how different bony geometries and skeletal structures can behavior under specific loading conditions. A computerized tomography (CT) of artificial bones, carried on at 1.5 mm of distance along sagittal, coronal and axial planes with the knee at 0° flexion (accuracy 0.5 mm), was used to obtain geometrical data of the model developed. Lines were imported into a commercial code (Hypermesh by Altair) in order to interpolate main surfaces and create the solid version of the model. In particular six different models were created according Roussoly's classification, by arranging geometrical position of the skeletal components. Loading conditions were obtained by applying muscular forces components to T1 till to L5, according to a reference model (Daniel M. 2011), and a fixed constrain was imposed on the lower part of the femurs. Materials were assumed as elastic with an Elastic modulus of 15 GPa, a Shear Modulus of 7 GPa for bony parts, and an Elastic modulus of 6 MPa, a Shear Modulus of 3 MPa for cartilaginous parts. Six different simulations have been carried out in order to evaluate the mechanical behavior of the human vertebral column arranged according to the Russoly's classification; results confirm higher solicitations obtained varying configurations from case I to case VI. In particular way, first three cases seem to supply the different loading configurations spreading stresses in almost all the bony parts of the column, while the remaining others three cases produce an higher concentration of stress around the lower part of spine (L3, L4, L5). Results confirm a good agreement with those present in literature (Winkle et al., 1999), an equivalent Von Mises average stress was of 0,55 MPa was found on the intervertebral disks with the higher values reached on the lower part of the column. A comparison of results obtained for Case I with literature (Galbusera et al., and El Rich et al., 2004), shows a good agreement in terms of normal compressive force, while more evident differences with Galbusera's results can be found for shear force and sagittal moment. The results underline a relationship between PI increase, and accordingly of PT and LL, and the distribution...

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“…Headgear structure can also be analyzed using finite element analysis. The impact strength of a headgear is represented by its ability to show minimum displacement and minimum von Mises stress value [15].…”

Section: Discussionmentioning

confidence: 99%

Headgear for Weakening Impact from Concussion in Rugby Games: Design and Development

Hussin

Shamsudin²,

Zakaria³

et al. 2019

IJRTE

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Rugby headgear is one of the important protective tool for protecting rugby players from head injury. However, there are still some professional or amateur rugby players who are not concerned about the use of headgear as a protective device. Rugby headgear has been created to protect the heads of rugby players in particular to avoid minor injuries such as wounds because rugby is a sport that requires strong physical movements and abusive techniques. At the same time, the ability of rugby headgear to protect against the occurrence of brain injury is questionable. Therefore, the objective of this project is to propose a conceptual design of rugby headgear by taking into account factors to prevent or reduce the potential of brain injury. The methodology used was a survey of professional and amateur rugby players to determine the need for the design of the headgear, conceptual map for the idea of development, House of Quality (HoQ) in assessing the needs of rugby players, Morphological Chart in determining the concept, Pugh's Selection Method in finding the most appropriate design. Headgear that is round and cover most of the heads has been selected as a conceptual design with sorbothane as core material. Valco strap was used as fastener and sponge in the head for the comfort to the player’s head

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FE analysis of stress and displacements occurring in the bony chain of leg

Cited by 20 publications

References 24 publications

Healing of tibial comminuted fractures by the meaning of an innovative intramedullary nail

Healing of tibial comminuted fractures by the meaning of an innovative intramedullary nail

Finite element analysis of sagittal balance in different morphotype: Forces and resulting strain in pelvis and spine

Headgear for Weakening Impact from Concussion in Rugby Games: Design and Development

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