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Scapulothoracic Joint

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Topic updated on 07/06/14 7:28pm
Anatomy
  • Function
    • allow scapular motion against the rib cage
  • Osteology
    • not a true joint, instead a sliding joint between medial border of scapular and ribs 2-7
    • resting position is angled anteriorly at 30° and an upward tilt of 3°
Biomechanics
  • Motion
    • during shoulder abduction the ratio of glenohumeral motion to scapulothoracic motion is 2:1 (GH does 120°, then ST does 60°)
  • Stability
    • 17 different muscles attach to or orginate from the scapula
      • trapezius
      • serratus anterior
      • deltoid
      • latisimus dorsi
      • lavator scapulae
      • rhomboid major
      • rhomboid minor
      • pectoralis major
      • pectoralis minor
      • teres major
      • triceps brachii
      • biceps brachii
      • coracobrachialis
      • infraspinatus
      • subscapularis
      • teres minor
      • supraspinatus
Clinical
  • Scapulothoracic dissociation 
  • Scapular winging 
  • Scapulothoracic dyskinesis 


 

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