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Updated: May 22, 2026
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Measurement of Dynamic Scapular Kinematics Using an Acromion Marker Cluster to Minimize Skin Movement Artifact
Published on: February 10, 2015
The function of the clavicle on scapular motion: a cadaveric study.
Noboru Matsumura1, Noriaki Nakamichi, Hiroyasu Ikegami
1Department of Orthopedic Surgery, School of Medicine, Keio University, Tokyo 160-8582, Japan. noboru18@gmail.com
Journal of Shoulder and Elbow Surgery
|May 22, 2012
Summary
Clavicular discontinuity significantly alters shoulder kinematics, reducing scapular rotation and tilting. This highlights the clavicle's crucial role in maintaining shoulder mobility and stability.
Area of Science:
- Orthopedics
- Biomechanics
- Anatomy
Background:
- The clavicle acts as a strut supporting the shoulder complex.
- Disruption of this strut may impair shoulder function and mobility.
Purpose of the Study:
- To investigate the effect of clavicular discontinuity on shoulder kinematics.
- To specifically analyze changes in scapular motion during arm elevation.
Main Methods:
- Utilized 14 cadaveric shoulder specimens.
- Simulated clavicular discontinuity and performed manual shoulder elevation in three planes (sagittal, scapular, coronal).
- Measured thorax-scapula distance and 3D scapular motion using electromagnetic tracking.
Main Results:
- Clavicular discontinuity decreased the thorax-scapula distance.
- Reduced scapular external rotation, upward rotation, and posterior tilting were observed.
- Kinematic changes were most pronounced during sagittal plane elevation.
Conclusions:
- Clavicular discontinuity negatively impacts shoulder kinematics.
- The clavicle is essential for stabilizing scapular rotation (external, upward, posterior) during arm elevation.
- This stabilization function may enhance glenohumeral motion and prevent subacromial impingement.
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