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Scapular kinematics and task specificity: The effect of load direction.

Erin C S Lee1, Nathan M Young2, Rebekah L Lawrence3

  • 1Department of Mechanical and Materials Engineering, Queen's University, 130 Stuart St., Kingston, ON K7L 2V9, Canada.

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|August 31, 2025
PubMed
Summary

Healthy scapula motion during arm lowering (adduction) involves more upward rotation than arm raising (abduction). This load-specific scapular movement may enhance shoulder joint stability and inform treatments for shoulder dysfunction.

Keywords:
Biplanar VideoradiographyGlenohumeral stabilityJoint mechanicsScapular kinematicsShoulder biomechanics

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Area of Science:

  • Biomechanics
  • Human Movement Science
  • Orthopedics

Background:

  • Current understanding of scapular motion primarily focuses on abduction against gravity.
  • Limited research exists on scapular contributions to concentric adduction, crucial for high-demand activities.
  • Scapular kinematics during arm lowering remain under-investigated.

Purpose of the Study:

  • To investigate and compare three-dimensional scapular kinematics during concentric shoulder adduction versus abduction.
  • To understand the load-specific nature of scapular upward rotation.
  • To identify factors contributing to glenohumeral joint stability during different arm movements.

Main Methods:

  • Combined biplanar videoradiography and optical motion capture.
  • Utilized a controllable cable machine for weighted tasks.
  • Compared scapulothoracic and glenohumeral kinematics during weighted pull-down (adduction) and press-up (abduction) in ten healthy adults.

Main Results:

  • Concentric adduction demonstrated significantly greater scapulothoracic upward rotation compared to concentric abduction.
  • Concentric adduction involved less glenohumeral abduction than concentric abduction.
  • Substantial inter-individual variability in scapular kinematics was observed.

Conclusions:

  • Scapular upward rotation is load-dependent, not solely tied to humerothoracic elevation.
  • Load-specific scapular motion may optimize glenoid orientation for joint stability.
  • Findings enhance understanding of healthy scapular kinematics, aiding in the identification and treatment of dyskinesis and informing musculoskeletal models.