The Experts below are selected from a list of 60006 Experts worldwide ranked by ideXlab platform
Ata M Kiapour - One of the best experts on this subject based on the ideXlab platform.
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uni directional coupling between tibiofemoral frontal and axial Plane Rotation supports valgus collapse mechanism of acl injury
2015Co-Authors: Ata M Kiapour, Vijay K Goel, Carmen E Quatman, Samuel C Wordeman, Timothy E Hewett, Constantine K DemetropoulosAbstract:Despite general agreement on the effects of knee valgus and internal tibial Rotation on anterior cruciate ligament (ACL) loading, compelling debate persists on the interrelationship between these Rotations and how they contribute to the multi-planar ACL injury mechanism. This study investigates coupling between knee valgus and internal tibial Rotation and their effects on ACL strain as a quantifiable measure of injury risk. Nineteen instrumented cadaveric legs were imaged and tested under a range of knee valgus and internal tibial torques. Posterior tibial slope and the medial tibial depth, along with changes in tibiofemoral kinematics and ACL strain, were quantified. Valgus torque significantly increased knee valgus Rotation and ACL strain (po0.020), yet generated minimal coupled internal tibial Rotation (p¼0.537). Applied internal tibial torque significantly increased internal tibial Rotation and ACL strain and generated significant coupled knee valgus Rotation (po0.001 for all comparisons). Similar knee valgus Rotations (7.3° vs 7.4°) and ACL strain levels (4.4% vs 4.9%) were observed under 50 Nm of valgus and 20 Nm of internal tibial torques, respectively. Coupled knee valgus Rotation under 20 Nm of internal tibial torque was significantly correlated with internal tibial Rotation, lateral and medial tibial slopes, and medial tibial depth (R 2 40.30; po0.020). These findings demonstrate uni-directional coupling between
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uni directional coupling between tibiofemoral frontal and axial Plane Rotation supports valgus collapse mechanism of acl injury
2015Co-Authors: Ata M Kiapour, Vijay K Goel, Carmen E Quatman, Samuel C Wordeman, Timothy E Hewett, Constantine K DemetropoulosAbstract:Despite general agreement on the effects of knee valgus and internal tibial Rotation on anterior cruciate ligament (ACL) loading, compelling debate persists on the interrelationship between these Rotations and how they contribute to the multi-planar ACL injury mechanism. This study investigates coupling between knee valgus and internal tibial Rotation and their effects on ACL strain as a quantifiable measure of injury risk. Nineteen instrumented cadaveric legs were imaged and tested under a range of knee valgus and internal tibial torques. Posterior tibial slope and the medial tibial depth, along with changes in tibiofemoral kinematics and ACL strain, were quantified. Valgus torque significantly increased knee valgus Rotation and ACL strain (p 0.30; p<0.020). These findings demonstrate uni-directional coupling between knee valgus and internal tibial Rotation in a cadaveric model. Although both knee valgus and internal tibial torques contribute to increased ACL strain, knee valgus Rotation has the ultimate impact on ACL strain regardless of loading mode.
Riccardo Tomasello - One of the best experts on this subject based on the ideXlab platform.
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in Plane Rotation of magnetic stripe domains in fe1 xgax thin films
2015Co-Authors: Riccardo Tomasello, M Sacchi, Horia Popescu, C Hepburn, Giovanni Finocchio, Maria Carpentieri, Marina Marangolo, Mahmoud Eddrief, Diego Bisero, Andrea RettoriAbstract:The in-Plane Rotation of magnetic stripe domains in a 65-nm magnetostrictive Fe0.8Ga0.2 epitaxial film was investigated combining magnetic force microscopy, vibration sample magnetometry, and x-ray resonant magnetic scattering measurements. We analyzed the behavior of the stripe pattern under the application of a bias magnetic field along the in-Plane direction perpendicular to the stripe axis, and made a comparison with the analogous behavior at remanence. The experimental results have been explained by means of micromagnetic simulations, supported by energy balance considerations. Fields smaller than ∼400 Oe do not induce any stripe Rotation; rather, a deformation of the closure domains pattern was evidenced. Larger fields produce a sudden Rotation of the stripe structure.
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in Plane Rotation of magnetic stripe domains in fe1 xgax thin films
2015Co-Authors: Samuele Fin, Riccardo Tomasello, M Sacchi, Horia Popescu, C Hepburn, Giovanni Finocchio, Marina Marangolo, Mahmoud Eddrief, Diego Bisero, Mario CarpentieriAbstract:The in-Plane Rotation of magnetic stripe domains in a 65-nm magnetostrictive ${\mathrm{Fe}}_{0.8}{\mathrm{Ga}}_{0.2}$ epitaxial film was investigated combining magnetic force microscopy, vibration sample magnetometry, and x-ray resonant magnetic scattering measurements. We analyzed the behavior of the stripe pattern under the application of a bias magnetic field along the in-Plane direction perpendicular to the stripe axis, and made a comparison with the analogous behavior at remanence. The experimental results have been explained by means of micromagnetic simulations, supported by energy balance considerations. Fields smaller than $\ensuremath{\sim}400$ Oe do not induce any stripe Rotation; rather, a deformation of the closure domains pattern was evidenced. Larger fields produce a sudden Rotation of the stripe structure.
Constantine K Demetropoulos - One of the best experts on this subject based on the ideXlab platform.
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uni directional coupling between tibiofemoral frontal and axial Plane Rotation supports valgus collapse mechanism of acl injury
2015Co-Authors: Ata M Kiapour, Vijay K Goel, Carmen E Quatman, Samuel C Wordeman, Timothy E Hewett, Constantine K DemetropoulosAbstract:Despite general agreement on the effects of knee valgus and internal tibial Rotation on anterior cruciate ligament (ACL) loading, compelling debate persists on the interrelationship between these Rotations and how they contribute to the multi-planar ACL injury mechanism. This study investigates coupling between knee valgus and internal tibial Rotation and their effects on ACL strain as a quantifiable measure of injury risk. Nineteen instrumented cadaveric legs were imaged and tested under a range of knee valgus and internal tibial torques. Posterior tibial slope and the medial tibial depth, along with changes in tibiofemoral kinematics and ACL strain, were quantified. Valgus torque significantly increased knee valgus Rotation and ACL strain (po0.020), yet generated minimal coupled internal tibial Rotation (p¼0.537). Applied internal tibial torque significantly increased internal tibial Rotation and ACL strain and generated significant coupled knee valgus Rotation (po0.001 for all comparisons). Similar knee valgus Rotations (7.3° vs 7.4°) and ACL strain levels (4.4% vs 4.9%) were observed under 50 Nm of valgus and 20 Nm of internal tibial torques, respectively. Coupled knee valgus Rotation under 20 Nm of internal tibial torque was significantly correlated with internal tibial Rotation, lateral and medial tibial slopes, and medial tibial depth (R 2 40.30; po0.020). These findings demonstrate uni-directional coupling between
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uni directional coupling between tibiofemoral frontal and axial Plane Rotation supports valgus collapse mechanism of acl injury
2015Co-Authors: Ata M Kiapour, Vijay K Goel, Carmen E Quatman, Samuel C Wordeman, Timothy E Hewett, Constantine K DemetropoulosAbstract:Despite general agreement on the effects of knee valgus and internal tibial Rotation on anterior cruciate ligament (ACL) loading, compelling debate persists on the interrelationship between these Rotations and how they contribute to the multi-planar ACL injury mechanism. This study investigates coupling between knee valgus and internal tibial Rotation and their effects on ACL strain as a quantifiable measure of injury risk. Nineteen instrumented cadaveric legs were imaged and tested under a range of knee valgus and internal tibial torques. Posterior tibial slope and the medial tibial depth, along with changes in tibiofemoral kinematics and ACL strain, were quantified. Valgus torque significantly increased knee valgus Rotation and ACL strain (p 0.30; p<0.020). These findings demonstrate uni-directional coupling between knee valgus and internal tibial Rotation in a cadaveric model. Although both knee valgus and internal tibial torques contribute to increased ACL strain, knee valgus Rotation has the ultimate impact on ACL strain regardless of loading mode.
Andrea Rettori - One of the best experts on this subject based on the ideXlab platform.
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in Plane Rotation of magnetic stripe domains in fe1 xgax thin films
2015Co-Authors: Riccardo Tomasello, M Sacchi, Horia Popescu, C Hepburn, Giovanni Finocchio, Maria Carpentieri, Marina Marangolo, Mahmoud Eddrief, Diego Bisero, Andrea RettoriAbstract:The in-Plane Rotation of magnetic stripe domains in a 65-nm magnetostrictive Fe0.8Ga0.2 epitaxial film was investigated combining magnetic force microscopy, vibration sample magnetometry, and x-ray resonant magnetic scattering measurements. We analyzed the behavior of the stripe pattern under the application of a bias magnetic field along the in-Plane direction perpendicular to the stripe axis, and made a comparison with the analogous behavior at remanence. The experimental results have been explained by means of micromagnetic simulations, supported by energy balance considerations. Fields smaller than ∼400 Oe do not induce any stripe Rotation; rather, a deformation of the closure domains pattern was evidenced. Larger fields produce a sudden Rotation of the stripe structure.
Mario Carpentieri - One of the best experts on this subject based on the ideXlab platform.
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in Plane Rotation of magnetic stripe domains in fe1 xgax thin films
2015Co-Authors: Samuele Fin, Riccardo Tomasello, M Sacchi, Horia Popescu, C Hepburn, Giovanni Finocchio, Marina Marangolo, Mahmoud Eddrief, Diego Bisero, Mario CarpentieriAbstract:The in-Plane Rotation of magnetic stripe domains in a 65-nm magnetostrictive ${\mathrm{Fe}}_{0.8}{\mathrm{Ga}}_{0.2}$ epitaxial film was investigated combining magnetic force microscopy, vibration sample magnetometry, and x-ray resonant magnetic scattering measurements. We analyzed the behavior of the stripe pattern under the application of a bias magnetic field along the in-Plane direction perpendicular to the stripe axis, and made a comparison with the analogous behavior at remanence. The experimental results have been explained by means of micromagnetic simulations, supported by energy balance considerations. Fields smaller than $\ensuremath{\sim}400$ Oe do not induce any stripe Rotation; rather, a deformation of the closure domains pattern was evidenced. Larger fields produce a sudden Rotation of the stripe structure.
