Application of a Density-Elastic Modulus Equation Developed for the Distal Ulna to Multiple Forearm Positions: A Finite Element Study

Neuert, Mark; Austman, Rebecca L.; Dunning, Cynthia E.

doi:10.1115/sbc2011-53577

Cited by 2 publications

(2 citation statements)

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“…The most frequently used study which investigated the effect of bone composition on bone mechanics which concluded that the stiffness and strength is dependent upon the cube and square respectively of the density [10]. In more recent studies, it was found that the density-modulus equation developed by Austman [16] can better approximate the material properties of ulna [17]. The study by Carter and et al, have used various specimens of bone densities to empirically derive expressions which can be used to estimate the ultimate strength of bone.…”

Section: Methodsmentioning

confidence: 99%

Stress Shielding in Cemented Hip Implants Assessed from Computed Tomography

Cheruvu¹,

Venkatarayappa

Goswami³

2019

BJSTR

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Background: Aseptic loosening is the major cause of revisions for hip replacement. This mode of failure is often caused by stress shielding. Stress shielding in the femur occurs when some of the loads are taken by the prosthesis and shielded from going to the bone. There is little information regarding the stress shielding among cemented hip implants.Purpose: The purpose of this study is to investigate the effect of stress shielding on the proximal femur with a femoral prosthesis.Methods: A patient had undergone open reduction and internal fixation (ORIF) due to a comminuted reversed oblique fracture of the right intertrochanteric hip. ORIF had failed and was converted to bipolar hemiarthroplasty. CT scans were performed on both the right and left hips. Housefield units were determined by using the probe tool. By using equations formulated by Carter and Hays, Linde et al., various parameters such as apparent density, Young's' modulus and ultimate strength were calculated. The results were compared to that a native hip. Results:The hip with the cemented implant had a significant increase in the apparent density, Young's modulus and ultimate strength, when compared to the left hip. In addition, it was found that the right hip had a higher strain energy density than that of the left.Interpretation: It has been concluded the most stress shielding occurred in the calcar region of the femur. The instances of stress shielding have been extensively reported for non-cemented or direct bone to implant constructs, this paper reports stress shielding in cemented implants supported by imaging data and biomechanical calculations carried out at the bone-cement-metal interface.

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Section: Methodsmentioning

confidence: 99%

Stress Shielding in Cemented Hip Implants Assessed from Computed Tomography

Cheruvu¹,

Venkatarayappa

Goswami³

2019

BJSTR

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“…We used the SOLID185 FE-shaped tetrahedron element. The assumed in this paper isotropy of the material is not ideal, but the CT data provided only scalar information, and the determination of principal material directions had to be inferred (Neuert et al, 2013).…”

Section: Parameters and Relationships Used In Simulationmentioning

confidence: 99%

Dynamic simulation of a novel "broomstick" human forward fall model and finite element analysis of the radius under the impact force during fall

Grzelczyk

Biesiacki

Mrozowski

et al. 2018

jtam

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The paper presents dynamic simulation and experimental identification of a human forward fall model describing the process of "falling like a broomstick" on the outstretched arms. The model implemented in Mathematica allows one to estimate time histories of the ground reaction force in different scenarios of the fall process. These time series are applied as time-varying load conditions to the numerical analysis of the human radial bone model created from the computed tomography data. Finally, the obtained numerical results indicate that the strain criterion seems to be more useful for estimating the radius fracture site in comparison to the stress criterion.

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Application of a Density-Elastic Modulus Equation Developed for the Distal Ulna to Multiple Forearm Positions: A Finite Element Study

Cited by 2 publications

References 0 publications

Stress Shielding in Cemented Hip Implants Assessed from Computed Tomography

Stress Shielding in Cemented Hip Implants Assessed from Computed Tomography

Dynamic simulation of a novel "broomstick" human forward fall model and finite element analysis of the radius under the impact force during fall

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