The Experts below are selected from a list of 33099 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
Journal of Biomechanics, 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
Journal of Biomechanics, 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.
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
Journal of Biomechanics, 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
Journal of Biomechanics, 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.
Timothy E Hewett - 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
Journal of Biomechanics, 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
Journal of Biomechanics, 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.
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the anterior cruciate ligament injury controversy is valgus Collapse a sex specific Mechanism
British Journal of Sports Medicine, 2009Co-Authors: Carmen E Quatman, Timothy E HewettAbstract:Background: Anterior cruciate ligament (ACL) injury is a devastating injury that puts an athlete at high risk of future osteoarthritis. Identification of risk factors and development of ACL prevention programmes likely decrease injury risk. Although studies indicate that sagittal plane biomechanical factors contribute to ACL loading Mechanisms, it is unlikely that non-contact ACL injuries occur solely in a sagittal plane. Some authors attempt to ascribe the solely sagittal plane injury Mechanism to both female and male ACL injuries and rebuff the concept that knee “valgus” is associated with isolated ACL injury. Prospective studies that utilise coupled biomechanical and epidemiological approaches demonstrated that frontal knee motions and torques are strong predictors of future non-contact ACL injury risk in female athletes. Video analysis studies also indicate a frontal plane “valgus Collapse” Mechanism of injury in women. As load sharing between knee ligaments is complex, frontal as well as sagittal and transverse plane loading Mechanisms likely contribute to non-contact ACL injury. The purpose of this review is to summarise existing evidence regarding ACL injury Mechanisms and to propose that sex-specific Mechanisms of ACL injury may occur, with women sustaining injuries by a predominantly “valgus Collapse” Mechanism. Conclusion: Prevention programmes and interventions that only target high-risk sagittal plane landing mechanics, especially in the female athlete, are likely to be less effective in ameliorating important frontal and transverse plane contributions to ACL injury Mechanisms and could seriously hamper ACL injury prevention efforts. Programmes that target the reduction of high-risk valgus and sagittal plane movements will probably prove to be superior for ACL injury prevention.
Carmen E Quatman - 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
Journal of Biomechanics, 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
Journal of Biomechanics, 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.
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the anterior cruciate ligament injury controversy is valgus Collapse a sex specific Mechanism
British Journal of Sports Medicine, 2009Co-Authors: Carmen E Quatman, Timothy E HewettAbstract:Background: Anterior cruciate ligament (ACL) injury is a devastating injury that puts an athlete at high risk of future osteoarthritis. Identification of risk factors and development of ACL prevention programmes likely decrease injury risk. Although studies indicate that sagittal plane biomechanical factors contribute to ACL loading Mechanisms, it is unlikely that non-contact ACL injuries occur solely in a sagittal plane. Some authors attempt to ascribe the solely sagittal plane injury Mechanism to both female and male ACL injuries and rebuff the concept that knee “valgus” is associated with isolated ACL injury. Prospective studies that utilise coupled biomechanical and epidemiological approaches demonstrated that frontal knee motions and torques are strong predictors of future non-contact ACL injury risk in female athletes. Video analysis studies also indicate a frontal plane “valgus Collapse” Mechanism of injury in women. As load sharing between knee ligaments is complex, frontal as well as sagittal and transverse plane loading Mechanisms likely contribute to non-contact ACL injury. The purpose of this review is to summarise existing evidence regarding ACL injury Mechanisms and to propose that sex-specific Mechanisms of ACL injury may occur, with women sustaining injuries by a predominantly “valgus Collapse” Mechanism. Conclusion: Prevention programmes and interventions that only target high-risk sagittal plane landing mechanics, especially in the female athlete, are likely to be less effective in ameliorating important frontal and transverse plane contributions to ACL injury Mechanisms and could seriously hamper ACL injury prevention efforts. Programmes that target the reduction of high-risk valgus and sagittal plane movements will probably prove to be superior for ACL injury prevention.
Vijay K Goel - 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
Journal of Biomechanics, 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
Journal of Biomechanics, 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.