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Related Experiment Video

Updated: May 9, 2026

Measurement of Dynamic Scapular Kinematics Using an Acromion Marker Cluster to Minimize Skin Movement Artifact
10:07

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Published on: February 10, 2015

Instantaneous helical axis methodology to identify aberrant neck motion.

Arin M Ellingson1, Vishal Yelisetti, Craig A Schulz

  • 1Department of Biomedical Engineering, University of Minnesota, Minneapolis, MN, USA.

Clinical Biomechanics (Bristol, Avon)
|August 6, 2013
PubMed
Summary

Aberrant neck motion, identified by helical axis folds during neck circumduction, is common in neck pain patients. Treatment reduced both pain and these motion abnormalities.

Keywords:
Aberrant motionCervical spineHelical axisKinematicsNeck pain

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Last Updated: May 9, 2026

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Area of Science:

  • Biomechanics
  • Clinical Kinematics
  • Pain Management

Background:

  • Neck pain affects 30-50% of US adults annually, lacking precise diagnostic methods for tailored treatment.
  • While planar neck kinematics correlates with pain, actual neck motion is more complex.
  • Current diagnostic techniques offer poor differentiation for individualized neck pain treatment.

Purpose of the Study:

  • To define a methodology for identifying aberrant neck kinematics.
  • To assess the presence and significance of aberrant neck motion in patients with neck pain.
  • To evaluate the relationship between aberrant motion and treatment outcomes.

Main Methods:

  • Utilized the instantaneous helical axis (IHA) approach to compute neck motion pathways during circumduction.
  • Analyzed neck circumduction in 81 non-specific neck pain patients and 20 healthy controls.
  • Defined aberrant motion as discontinuities (folds) in the helical axis patterns.

Main Results:

  • Aberrant motion (folds) were prevalent in neck pain patients but nearly absent in healthy subjects.
  • Following treatment, neck pain patients showed significant reductions in pain and disability index.
  • A significant decrease in the number of aberrant motion folds was observed post-treatment.

Conclusions:

  • The instantaneous helical axis approach effectively detects subtle abnormalities in head-trunk motion during neck circumduction.
  • This novel technique offers a potential method for diagnosing aberrant neck kinematics.
  • Findings suggest a link between treatment-induced pain reduction and improved neck motion patterns.