Introduction: Evaluation of nerve mechanical properties has the potential to improve assessment of nerve impairment. Shear wave velocity, as measured by using shear wave (SW) ultrasound elastography, is a promising indicator of nerve mechanical properties such as stiffness. However, elucidation of external factors that influence SW velocity, particularly nerve tension, is required for accurate interpretations.
Methods: Median and ulnar nerve SW velocities were measured at proximal and distal locations with limb positions that indirectly altered nerve tension.
Results: Shear wave velocity was greater at proximal and distal locations for limb positions that induced greater tension in the median (mean increase proximal 89.3%, distal 64%) and ulnar (mean increase proximal 91.1%, distal 37.4%) nerves.
Discussion: Due to the influence of nerve tension when SW ultrasound elastography is used, careful consideration must be given to limb positioning.
Keywords: mechanical properties; nerve cross-sectional area; neuromuscular ultrasound; peripheral nerve; shear wave ultrasound elastography; tension.
© 2020 Wiley Periodicals, Inc.