Updated: 6/3/2021

Scapulothoracic Joint

0%
Topic
Review Topic
0
0
100%
0%
Evidence
1
0
0
Topic
Images
https://upload.orthobullets.com/topic/3035/images/shouldermvmnt.jpg
https://upload.orthobullets.com/topic/3035/images/scapulothoracic joint.jpg
https://upload.orthobullets.com/topic/3035/images/st_joint.jpg
  • Introduction
    • Function
      • allows scapular motion against the rib cage
    • Osteology
      • not a true joint; actually an articulation between the scapula and the thorax
      • is a sliding "joint" between medial border of scapula and ribs 2-7
      • resting position angulation (although these are variable even in healthy adults)
        • anteriorly 10-20°
        • internally rotated 30°-45° from the coronal plane
        • upward tilt of 3°
  • Biomechanics
    • Motion
      • primary motion
        • elevation & depression
          • movement up and down along the rib cage
      • secondary motions
        • protraction & retraction
          • movement away from or toward the vertebral column
        • upward & downward rotation
          • upward rotation with arm elevation
          • downwared rotation with arm returning to side from raised position
        • internal & external rotation
        • anterior & posterior tipping
      • 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 originate from the scapula
        • trapezius
        • serratus anterior
        • deltoid
        • latisimus dorsi
        • levator scapulae
        • rhomboid major
        • rhomboid minor
        • omohyoid - inferior belly
        • pectoralis minor
        • teres major
        • teres minor
        • triceps brachii
        • biceps brachii
        • coracobrachialis
        • infraspinatus
        • subscapularis
        • supraspinatus
  • Clinical
    • Scapulothoracic dissociation
    • Scapular winging
    • Scapulothoracic dyskinesis
Flashcards (0)
Cards
1 of 0
Evidence (1)
VIDEOS & PODCASTS (1)
EXPERT COMMENTS (4)
Private Note