A Magnetic Resonance-Compatible Loading Device for Dynamically Imaging Shortening and Lengthening Muscle Contraction Mechanics

Journal of Medical Devices
Amy SilderDarryl G Thelen

Abstract

The purpose of this study was to design and test a magnetic resonance (MR)-compatible device to induce either shortening or lengthening muscle contractions for use during dynamic MR imaging. The proposed device guides the knee through cyclic flexion-extension, while either elastic or inertial loads are imposed on the hamstrings. Ten subjects were tested in a motion capture laboratory to evaluate the repeatability of limb motion and imposed loads. Image data were subsequently obtained for all ten subjects using cine phase contrast imaging. Subjects achieved ~30 deg of knee joint motion, with individual subjects remaining within ~1 deg of their average motion across 56 repeated cycles. The maximum hamstring activity and loading occurred when the knee was flexed for the elastic loading condition (shortening contraction), and extended for the inertial loading condition (lengthening contraction). Repeat MR image acquisitions of the same loading condition resulted in similar tissue velocities, while spatial variations in velocity data were clearly different between loading conditions. The proposed device can enable dynamic imaging of the muscle under different types of loads, which has the potential to improve our understanding of ba...Continue Reading

References

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Citations

Feb 24, 2016·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Xeni DeligianniFrancesco Santini
Jan 13, 2012·Journal of Biomechanics·Niccolo M FiorentinoSilvia S Blemker
Jun 14, 2012·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Jarred KaiserDarryl G Thelen
Jun 29, 2013·Journal of Biomechanics·Christopher J WestphalDarryl G Thelen
May 18, 2010·Journal of Biomechanics·Amy SilderDarryl G Thelen
Oct 23, 2013·Medicine and Science in Sports and Exercise·Niccolo M FiorentinoSilvia S Blemker
Apr 29, 2015·Annals of Biomedical Engineering·Rachel L LenhartDarryl G Thelen

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