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Related Experiment Video

Updated: Jan 14, 2026

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Differences in 3-dimensional Spinal Angles During Thoracic Axial Rotation in the Sitting Position Between Thoracic

Sun-Shil Shin1, Won-Gyu Yoo1

  • 1Department of Physical Therapy, College of Healthcare Medical Science and Engineering, INJE University, Gimhae-si, Gyeongsangnam-do, Republic of Korea.

Journal of Manipulative and Physiological Therapeutics
|October 24, 2025
PubMed
Summary

Thoracic spine angle impacts trunk rotation mechanics. Slight thoracic kyphosis in asymptomatic individuals alters lumbar and pelvic motion during axial rotation.

Keywords:
Axial RotationKyphosisSitting Position

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Area of Science:

  • Biomechanics
  • Spinal Kinematics
  • Human Movement Analysis

Background:

  • Trunk rotation involves complex interactions between the thoracic spine, lumbar spine, and pelvis.
  • Understanding how thoracic spine morphology influences spinal kinematics is crucial for assessing functional movement and potential injury risk.

Purpose of the Study:

  • To investigate the effects of thoracic spine angle on lumbar and pelvic rotation during trunk axial rotation.
  • To analyze coupled motions in relation to thoracic curvature.

Main Methods:

  • Twenty-two asymptomatic volunteers were assessed using inertial measurement units at multiple spinal levels (T1, T7, T12, L3, S2).
  • Participants were categorized into kyphotic thoracic and normal thoracic groups based on T1-T12 angle measurements.
  • Trunk axial rotation was performed in a seated position, with Eulerian angles measured at various spinal levels.

Main Results:

  • Greater rotation angles were observed at the T1 and S2 levels in the kyphotic thoracic group compared to the normal thoracic group.
  • Significant differences (P < .05) were found for both right and left rotation at these levels.

Conclusions:

  • Thoracic curvature, specifically slight kyphosis, influences trunk axial rotation mechanics in asymptomatic individuals.
  • These findings highlight the importance of thoracic spine alignment in overall spinal motion and coupled movements.