Differential displacement of soft tissue layers from manual therapy loading, 2016

Topics: Spinal manipulation, Biomechanics, Elastography, Cumulative displacement, Shear displacement, Electromyography

Authors: Shawn Engell, John J. Triano, James R. Fox, Helene M. Langevin and Elisa E. Konofagou


BACKGROUND: Understanding the biomechanics of spinal manipulative therapy requires knowing how loads are transmitted to deeper structures. This investigation monitored displacement at sequential depths in thoracic paraspinal tissues parallel with surface load directions. METHODS: Participants were prone and a typical preload maneuver was applied to thoracic tissues. Ultrasound speckle tracking synchronously monitored displacement and shear deformation of tissue layers in a region of interest adjacent to load application to a depth of 4 cm. Cumulative and shearing displacements along with myoelectric activity were quantitatively estimated adjacent to loading site. FINDINGS: The cephalocaudal cumulative displacement in layers parallel to the surface were, in order of depth, 1.27 (SD=0.03), 1.18 (SD=0.02), and 1.06 (SD=0.01) mm (P

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