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• W2015308613 abstract "The purpose of this study was to provide the first in vivo 3-dimensional (3D) measures of knee extensor moment arms, measured during dynamic volitional activity. The hypothesis was that the vastus lateralis (VL) and vastus medialis (VM) have significant off-axis moment arms compared to the central quadriceps components. After obtaining informed consent, three 3D dynamic cine phase contrast (PC) MRI sets (x,y,z velocity and anatomic images) were acquired from 22 subjects during active knee flexion and extension. Using a sagittal-oblique and two coronal-oblique imaging planes, the origins and insertions of each quadriceps muscle were identified and tracked through each time frame by integrating the cine-PC velocity data. The moment arm (MA) and relative moment (RM, defined as the cross product of the tendon line-of-action and a line connecting the line-of-action with the patellar center of mass) were calculated for each quadriceps component. The tendencies of the VM and VL to produce patellar tilt were evenly balanced. Interestingly, the magnitude of RM-P(Spin) for the VM and VL is approximately four times greater than the magnitude of RM-P(Tilt) for the same muscles suggesting that patellar spin may play a more important role in patellofemoral kinematics than previously thought. Thus, a force imbalance that leads to excessive lateral tilt, such as VM weakness in patellofemoral pain syndrome, would produce excessive negative spin (positive spin: superior patellar pole rotates laterally) and to a much greater degree. This would explain the increased negative spin found in recent studies of patellar maltracking. Assessing the contribution of each quadriceps component in three dimensions provides a more complete understanding of muscle functionality." @default.
• W2015308613 created "2016-06-24" @default.
• W2015308613 creator A5080093371 @default.
• W2015308613 creator A5081721479 @default.
• W2015308613 date "2009-08-01" @default.
• W2015308613 modified "2023-09-25" @default.
• W2015308613 title "Dynamic in vivo 3-dimensional moment arms of the individual quadriceps components" @default.
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• W2015308613 doi "https://doi.org/10.1016/j.jbiomech.2009.05.011" @default.
• W2015308613 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2737723" @default.
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