Internal–external circumferential crack behaviour in the cement layer of total hip replacement

Oshkour, Azim Ataollahi; Osman, Noor Azuan Abu; Yau, Yat Huang; Tarlochan, Faris; Pramanik, Sumit; Abas, Wan Abu Bakar Wan

doi:10.1111/ffe.12026

Cited by 5 publications

(3 citation statements)

References 45 publications

(93 reference statements)

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“…(b), which is approximated from the saw‐bones catalogue by using photogrammetric software ImageJ to measure the cortical bone thickness at various points from cross‐sectional photographs. This was carried out to improve model accuracy over models, which assume uniform cortical‐bone thickness such as those presented by Oshkour et al and Cilingir et al . Because of the model's complex geometry, it was meshed in a commercial package (UGS NX 7.5) using tetrahedral elements set to a spacing of 2 mm.…”

Section: Finite Element Analysismentioning

confidence: 99%

Extending structural health monitoring concepts for bone healing assessment

Ong

Chiu

Russ

et al. 2016

Fatigue Fract Eng Mat Struct

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A B S T R A C T A series of experimental investigations are performed to show the potential of integrating sensing elements into an external fixation for healing assessment of a fracture femur. This investigation is supported by finite element analyses that highlight the fundamental structural dynamics, which enable a stiffness-based healing assessment methodology. A saw-bone femur externally fixated with a Hoffman II will be subjected to an artificial fracture. The healing of the fractured femur is simulated with the curing of epoxy applied to the fractured region. The finite element analyses results will help determine the useful modes for assessing the state of healing of the fracture that can be attributed to the changes in the stiffness of the fixated structure. The findings will be tested against a set of experiments to show how the stiffness-related quantities can be delineated from the dynamic response. The results reported will show distinct changes to the frequency response functions as the epoxy cures demonstrating the potential of integrating sensors onto an external fixation for healing and fracture union assessment.Keywords bone fracture; bone healing assessment; structural health monitoring. N O M E N C L A T U R E(x,y,z) = Cartesian coordinate system ρ = density E = Young's modulus ν = Poisson's ratio f = frequency Z tf ( f ) = transfer function v force (t) = voltage time series from force transducer attached to impactor (load cell) v PVDF (t) = voltage time series from polyvinylidene fluoride sensor (film sensor) vˆf orce f ð Þ = voltage amplitude in frequency domain from force transducer attached to impactor vˆP VDF f ð Þ = voltage amplitude in frequency domain from polyvinylidene fluoride sensor ε(t) = strain time series ε s (f) = strain spectrum i(t) = input force time series Iˆf ð Þ = input force spectrum K force = force constant K PVDF = strain constant

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Section: Finite Element Analysismentioning

confidence: 99%

Extending structural health monitoring concepts for bone healing assessment

Ong

Chiu

Russ

et al. 2016

Fatigue Fract Eng Mat Struct

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show abstract

“…However, coating could be flaked off from metals substrate because of weak bond between ceramic and metallic phases [ 21 ]. In addition, our several theoretical studies have shown that stress intensity factors at the external surface of the cement layer of the cement coated metallic implants are higher which may be the primary cause of easy flaking off of the coatings from the metallic surfaces [ 22 , 23 ]. Composites of many ceramics, including HA [ 13 , 24 ], CS [ 14 , 25 ], and alumina (Al 2 O 3 ) [ 5 , 26 ], have been used in different biomedical applications successfully.…”

Section: Introductionmentioning

confidence: 99%

A Comparison in Mechanical Properties of Cermets of Calcium Silicate with Ti-55Ni and Ti-6Al-4V Alloys for Hard Tissues Replacement

Oshkour

Pramanik

Shirazi

et al. 2014

The Scientific World Journal

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This study investigated the impact of calcium silicate (CS) content on composition, compressive mechanical properties, and hardness of CS cermets with Ti-55Ni and Ti-6Al-4V alloys sintered at 1200°C. The powder metallurgy route was exploited to prepare the cermets. New phases of materials of Ni16Ti6Si7, CaTiO3, and Ni31Si12 appeared in cermet of Ti-55Ni with CS and in cermet of Ti-6Al-4V with CS, the new phases Ti5Si3, Ti2O, and CaTiO3, which were emerged during sintering at different CS content (wt%). The minimum shrinkage and density were observed in both groups of cermets for the 50 and 100 wt% CS content, respectively. The cermets with 40 wt% of CS had minimum compressive Young's modulus. The minimum of compressive strength and strain percentage at maximum load were revealed in cermets with 50 and 40 wt% of CS with Ti-55Ni and Ti-6Al-4V cermets, respectively. The cermets with 80 and 90 wt% of CS showed more plasticity than the pure CS. It concluded that the composition and mechanical properties of sintered cermets of Ti-55Ni and Ti-6Al-4V with CS significantly depend on the CS content in raw cermet materials. Thus, the different mechanical properties of the cermets can be used as potential materials for different hard tissues replacements.

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“…Different implant designs can be analyzed more accurately by conducting FEA in a computer rather than performing time‐consuming, destructive, and costly mechanical and in vivo tests . FEA is commonly conducted to study artificial hip joint biomechanics and femoral prosthetic designs . Many FEA studies have also focused on the optimization of the geometry and material of femoral prostheses to develop THR with a long lifespan .…”

mentioning

confidence: 99%

Effect of Geometrical Parameters on the Performance of Longitudinal Functionally Graded Femoral Prostheses

et al. 2014

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This study aimed to assess the performance of different longitudinal functionally graded femoral prostheses. This study was also designed to develop an appropriate prosthetic geometric design for longitudinal functionally graded materials. Three-dimensional models of the femur and prostheses were developed and analyzed. The elastic modulus of these prostheses in the sagittal plane was adjusted along a gradient direction from the distal end to the proximal end. Furthermore, these prostheses were composed of titanium alloy and hydroxyapatite. Results revealed that strain energy, interface stress, and developed stress in the femoral prosthesis and the bone were influenced by prosthetic geometry and gradient index. In all of the prostheses with different geometries, strain energy increased as gradient index increased. Interface stress and developed stress decreased. The minimum principal stress and the maximum principal stress of the bone slightly increased as gradient index increased. Hence, the combination of the femoral prosthetic geometry and functionally graded materials can be employed to decrease stress shielding. Such a combination can also be utilized to achieve equilibrium in terms of the stress applied on the implanted femur constituents; thus, the lifespan of total hip replacement can be prolonged.

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Internal–external circumferential crack behaviour in the cement layer of total hip replacement

Cited by 5 publications

References 45 publications

Extending structural health monitoring concepts for bone healing assessment

Extending structural health monitoring concepts for bone healing assessment

A Comparison in Mechanical Properties of Cermets of Calcium Silicate with Ti-55Ni and Ti-6Al-4V Alloys for Hard Tissues Replacement

Effect of Geometrical Parameters on the Performance of Longitudinal Functionally Graded Femoral Prostheses

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