Stress analysis of a centrally fractured rib fixated by an intramedullary screw

Liovic, Petar; Šutalo, Ilija D.; Marasco, Silvana

doi:10.1080/10255842.2012.727402

Cited by 6 publications

(4 citation statements)

References 32 publications

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“…Modelling of a posterior fracture in an idealised sixth rib confirmed overlap of the fracture ends with repetitive typical forces acting on that rib [ 8 , 12 , 13 ] (Fig. 5a ).…”

Section: Resultsmentioning

confidence: 99%

“…Surgical technique has been previously described [ 3 , 12 ]. In brief, only rib fractures between the levels of ribs 3 and 10 were fixed, usually requiring only one or two incisions.…”

Section: Methodsmentioning

confidence: 99%

“…FEA was utilised to model the forces acting on a posterior fracture with and without an intramedullary fixation splint in situ. The model used has been previously described [ 8 , 12 ] and incorporates all muscle forces acting on the rib as well as the intrathoracic pressures generated during breathing and coughing. The ANSYS 13.0 package (ANSYS 2011) was used for the solid mechanics FEA.…”

Section: Methodsmentioning

confidence: 99%

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An assessment of outcomes with intramedullary fixation of fractured ribs

Marasco

Quayle

Summerhayes

et al. 2016

J Cardiothorac Surg

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BackgroundSurgical management of fractured ribs with internal fixation is an increasingly accepted therapy. Concurrently, specific rib fixation prostheses are being developed which should improve results and minimise hardware and rib/splint construct failures. The Synthes titanium intramedullary splint lends itself to difficult to access areas such as posterior rib fractures and fractures under the scapula. We analyse a case series of patients in whom this rib fixation prosthesis has been used.MethodsFifteen patients received 35 intramedullary splints. Follow up at 3 and 6 months was performed with three dimensional computed tomography scanning to assess for bone alignment, callus formation and healing, residual deformity, hardware failure or cut through. Computerized finite element analysis (FEA) was used to model forces acting on a posterior fracture with and without an intramedullary fixation splint in situ.ResultsComplete healing (bony union) was noted in only 3 (9 %) of the fractures fixed with splints by 3 months. Partial healing (cartilaginous union) was noted in 28 of the 33 fractures (85 %), and non healing was noted in only 2 (6 %). In both those two patients, failure at the rib / splint interface was noted after both patients reported sneezing. No hardware failures were noted. By 6 months the fractures which had shown partial healing, had all completely healed. There were no late failures (between 3 and 6 months) of either hardware or rib/splint interfaces.FEA modelling identified sites of increased stress in the rib at the rib / splint interface and in a modelled intramedullary splint where it spans the fracture.ConclusionsFurther analysis of outcomes with intramedullary splints is warranted as well as further development of intramedullary rib fixation solutions.

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“…Modelling of a posterior fracture in an idealised sixth rib confirmed overlap of the fracture ends with repetitive typical forces acting on that rib [ 8 , 12 , 13 ] (Fig. 5a ).…”

Section: Resultsmentioning

confidence: 99%

“…Surgical technique has been previously described [ 3 , 12 ]. In brief, only rib fractures between the levels of ribs 3 and 10 were fixed, usually requiring only one or two incisions.…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

An assessment of outcomes with intramedullary fixation of fractured ribs

Marasco

Quayle

Summerhayes

et al. 2016

J Cardiothorac Surg

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“…Finite elements of the PLANE182 type (with a higher-order shape function) accessible in ANSYS Workbench 19.2 [ 36 ] were used to discretise individual geometric models of the analysed construction variants of the gaskets. In particular areas of the model, the mesh of the finite elements was densified, mainly in the area of contact between the gasket and the plates of the hydraulic press.…”

Section: Methodsmentioning

confidence: 99%

Basic Design Parameters Influencing on Axial Stiffness of the Spiral Wound Gasket

Jaszak,

Grzejda,

Kluczyński

et al. 2023

Materials

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The article presents the influence of important design parameters of a spiral gasket on axial stiffness and leakage level. These parameters were the angle of inclination of the central part of the spiral section, the length of the vertical part of the spiral section, and the degree of densification of the material filling the metal coils. The scope of work was divided into two stages. In the first, experimental tests were conducted to determine the stiffness and tightness of a standard spiral gasket at two extreme levels of densification of the filler material, and the elastic–plastic properties of expanded graphite, which is the filler material of the metal spirals, were determined. In the second stage, multivariate numerical calculations were carried out to determine the axial stiffness of the gasket and to evaluate the distribution of contact pressure on the sealing surface. A novel aspect of the work is the proposal of a mathematical model to estimate the averaged value of the modulus of elasticity of the filler material as a function of the degree of densification and the execution of an experimental plan that significantly allowed the adoption of a limited number of analysed model variants used in the numerical calculations.

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