Scapulothoracic Joint

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Topic updated on 11/27/11 12:09pm
Introduction
  • Overview
    • not a true joint, instead a sliding joint between medial border of scapular and ribs 2-7
    • functions to allow scapular motion against the rib cage
    • resting position is angled anteriorly at 30° and an upward tilt of 3°
  • Motion
    • During shoulder abduction the ratio of glenohumeral motion to scapulothoracic motion is 2:1 (GH does 120°, then ST does 60°)
  • Stability
    • position fixed primarily by scapular muscle attachments

 

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