23.20 Dynamic elements in gleno-humeral stability

• Rotator cuff (muscles) are the primary dynamic stabilizer

  • Supraspinatus, subscapularis, infraspinatus, and teres minor

  • The have similar anotomical topograpy

  • Their role as coaptors of the humeral head are more important they their fuction as rotators

  • They apply rapid tension that compresses the humeral head into the glenoid fossa (cup) and labrum (fibrocartiliginous rim of the cup)

• The tendon of the long head of the biecpes acts with the rotator cuff

• The all have a muscle belly originating from the scapular and terminating with a long tending crossing the glenohumeral joint and merging with the capsule distally.

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