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A Novel Application of Musculoskeletal Ultrasound Imaging

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Assessing Sciatic Nerve Excursion and Strain with Ultrasound Imaging during Forward Bending.

Richard Ellis¹, Nathan Richards², Logan Archer²

¹Department of Physiotherapy, School of Clinical Sciences, Auckland University of Technology, Northcote, Auckland, New Zealand; Active Living and Rehabilitation: Aotearoa New Zealand, Health and Rehabilitation Research Institute, School of Clinical Sciences, Auckland University of Technology, Northcote, Auckland, New Zealand.

Ultrasound in Medicine & Biology

|July 5, 2021

Summary

Ultrasound reliably measures sciatic nerve excursion during forward bending. Hip flexion strongly predicts nerve movement, aiding clinical assessment of nerve entrapment and guiding future research on neural biomechanics.

Keywords:

Forward bending Nerve excursion Nerve strain Sciatic nerve Ultrasound imaging

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Area of Science:

Neuroscience
Biomechanics
Medical Imaging

Background:

Entrapment neuropathies can alter sciatic nerve biomechanics, impacting excursion and strain.
Limited in vivo data exists on sciatic nerve behavior during forward bending.

Purpose of the Study:

To evaluate ultrasound imaging reliability for measuring sciatic nerve excursion and strain during forward bending.
To quantify nerve excursion and strain, and explore their relationship with hip and lumbar spine motion.

Main Methods:

Utilized ultrasound imaging to assess sciatic nerve excursion and strain in vivo.
Measured hip flexion and lumbar spine movement during forward bending tasks.

Main Results:

High to excellent reliability was found for measuring sciatic nerve excursion.
Moderate reliability was observed for sciatic nerve strain measurements.
Hip flexion emerged as a significant predictor of sciatic nerve excursion.

Conclusions:

Ultrasound is a reliable tool for assessing sciatic nerve excursion during forward bending.
Findings provide a basis for clinical evaluation and treatment of sciatic nerve entrapment neuropathies.
Quantification of nerve biomechanics during movement offers insights for future research.