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Influence of limb position on assessment of nerve mechanical properties by using shear wave ultrasound elastography
Chelsea L Rugel1, Colin K Franz2,3,4, Sabrina S M Lee1
1Department of Physical Therapy and Human Movement Sciences, Northwestern University Feinberg School of Medicine, Chicago, Illinois.
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.
