Cortical bone failure mechanisms during screw pullout

Feerick, Emer M.; McGarry, J. Patrick

doi:10.1016/j.jbiomech.2012.03.023

Cited by 39 publications

(24 citation statements)

References 27 publications

(33 reference statements)

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“…The calculated shear strength of the screw prototype in this work is 22.2 kN based on Chapman's equation [39]. This value is above the shear strength of the cortical bone suggested by Feerick and McGarry [40]. The maximum pull-out load of the screw prototype of about 3800 N is within the range of the pullout load of a common cortical screw on composite femur of human cadaver (2600-7800 N) [41].…”

Section: Tensilesupporting

confidence: 45%

Mechanical and corrosion properties of partially degradable bone screws made of pure iron and stainless steel 316L by friction welding

et al. 2017

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Section: Tensilesupporting

confidence: 45%

Mechanical and corrosion properties of partially degradable bone screws made of pure iron and stainless steel 316L by friction welding

et al. 2017

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“…The present study has shown that a continuum based pressure dependent DP plasticity formulation is also inadequate in capturing the inelastic trabecular behaviour although previously implemented for trabecular bone (Bessho et al 2007;Derikx et al 2011). Kelly and McGarry (2012) and the present study have demonstrated that continuum based plasticity formulations such as the DP and Mohr-Coulomb formulations that that have linear yield surfaces in the q-p plane are inappropriate for modelling trabecular bone, although they have been shown to capture the inelastic behaviour of cortical bone (Feerick and McGarry 2012;Mullins et al 2009). Plasticity formulations such as 22 the modified super-ellipsoid yield criterion (Bayraktar et al 2004a), the Tsai-Wu plasticity formulation (Fenech and Keaveny 1999;Keaveny et al 1999) and a cellular solid criterion (Fenech and Keaveny 1999) have also been proposed to describe the multiaxial yielding of trabecular bone.…”

mentioning

confidence: 72%

An experimental and computational investigation of the post-yield behaviour of trabecular bone during vertebral device subsidence

Kelly

Harrison

McDonnell

et al. 2012

Biomech Model Mechanobiol

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PublisherSpringer-Verlag AbstractInterbody fusion device subsidence has been reported clinically. An enhanced understanding of the mechanical behaviour of the surrounding bone would allow for accurate predictions of vertebral subsidence. The multiaxial inelastic behaviour of trabecular bone is investigated at a microscale and macroscale level. The post-yield behaviour of trabecular bone under hydrostatic and confined compression is investigated using micro-computed tomography derived microstructural models, elucidating a mechanism of pressure dependent yielding at the macroscopic level. Specifically, microstructural trabecular simulations predict a distinctive yield point in the apparent stress-strain curve under uniaxial, confined and hydrostatic compression. Such distinctive apparent stress-strain behaviour results from localised stress concentrations and material yielding in the trabecular microstructure. This phenomenon is shown to be independent of the plasticity formulation employed at a trabecular level. The distinctive response can be accurately captured by a continuum model using a crushable foam plasticity formulation in which pressure dependent yielding occurs.Vertebral device subsidence experiments are also performed, providing measurements of the trabecular plastic zone. It is demonstrated that a pressure dependent plasticity formulation must be used for continuum level macroscale models of trabecular bone in order to replicate the experimental observations, further supporting the microscale investigations. Using a crushable foam plasticity formulation in the simulation of vertebral subsidence, it is shown that the predicted subsidence force and plastic zone size correspond closely with the experimental measurements. In contrast the use of von Mises, Drucker-Prager and Hill plasticity formulations for continuum trabecular bone models lead to over prediction of the subsidence force and plastic zone.

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“…Many studies use pull-out tests to evaluate the performance of bone screws (Feerick and McGarry 2012); however, concerns have been raised as to whether they are representative of screw fastening (Gefen 2002). An additional idealised simulation was run to demonstrate the differences in mechanical response between pull-out and screw-fastening, particularly in terms of stress -strain environment.…”

Section: Resultsmentioning

confidence: 99%

Reasons why dynamic compression plates are inferior to locking plates in osteoporotic bone: a finite element explanation

MacLeod

Simpson

Pankaj

2014

Computer Methods in Biomechanics and Biomedical Engineering

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While locking plate fixation is becoming increasingly popular for complex and osteoporotic fractures, for many indications compression plating remains the standard choice. This study compares the mechanical behaviour of the more recent locking compression plate (LCP) device, with the traditional dynamic compression plates (DCPs) in bone of varying quality using finite element modelling. The bone properties considered include orthotropy, inhomogeneity, cortical thinning and periosteal apposition associated with osteoporosis. The effect of preloads induced by compression plating was included in the models. Two different fracture scenarios were modelled: one with complete reduction and one with a fracture gap. The results show that the preload arising in DCPs results in large principal strains in the bone all around the perimeter of the screw hole, whereas for LCPs large principal strains occur primarily on the side of the screw proximal to the load. The strains within the bone produced by the two screw types are similar in healthy bone with a reduced fracture gap; however, the DCP produces much larger strains in osteoporotic bone. In the presence of a fracture gap, the DCP results in a considerably larger region with high tensile strains and a slightly smaller region with high compressive strains. These findings provide a biomechanical basis for the reported improved performance of locking plates in poorer bone quality.

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Cortical bone failure mechanisms during screw pullout

Cited by 39 publications

References 27 publications

Mechanical and corrosion properties of partially degradable bone screws made of pure iron and stainless steel 316L by friction welding

Mechanical and corrosion properties of partially degradable bone screws made of pure iron and stainless steel 316L by friction welding

An experimental and computational investigation of the post-yield behaviour of trabecular bone during vertebral device subsidence

Reasons why dynamic compression plates are inferior to locking plates in osteoporotic bone: a finite element explanation

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