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Published on: February 10, 2015
3-D scapular kinematics during arm elevation: effect of motion velocity
F Fayad1, G Hoffmann, S Hanneton
1Service de Rééducation et de Réadaptation de l'appareil locomoteur et des Pathologies du Rachis, Université René Descartes Paris V, Hôpital cochin, 27 Rue du Fbg St Jacques, 75014 Paris, France. fouadfayad@yahoo.fr
Clinical Biomechanics (Bristol, Avon)
|June 16, 2006
Summary
Three-dimensional (3-D) scapular kinematics during arm elevation are complex. Static measurements do not fully capture dynamic scapular motion, especially lateral rotation during arm elevation.
Area of Science:
- Biomechanics
- Human Movement Science
- Orthopedics
Background:
- Limited three-dimensional (3-D) data exist on motion velocity's influence on scapular kinematics.
- Previous studies on arm elevation velocity effects were primarily two-dimensional.
Purpose of the Study:
- To investigate the three-dimensional (3-D) scapular kinematics during arm elevation at different velocities.
- To compare dynamic scapular motion with static measurements.
Main Methods:
- Thirty healthy subjects performed dominant arm elevation in sagittal and frontal planes at slow and fast speeds.
- A 6-degree-of-freedom electromagnetic system recorded scapular orientation and humeral elevation.
- Scapular orientation was also measured in static positions.
Main Results:
- A complex 3-D motion of the scapula during arm elevation and lowering was described.
- Scapular rotations (protraction/retraction, tilt) did not significantly differ between static and dynamic tasks or slow and fast movements.
- Scapular lateral rotation values were significantly different between static and dynamic measurements, being less in static positions.
Conclusions:
- Interpolating static bone positions is insufficient to accurately represent scapular kinematics.
- Dynamic 3-D motion analysis is crucial for understanding scapular behavior during arm elevation.
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