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The Shoulder Complex

The Shoulder Complex

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The Shoulder Complex

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  1. The Shoulder Complex Applied Kinesiology 420:151

  2. Agenda • Introduction to the shoulder complex • Articulations of the shoulder complex • Scapulohumeral rhythm

  3. Introduction to the Shoulder Complex • Shoulder girdle + shoulder joint = shoulder complex • Shoulder girdle: • Scapula, clavicle and articulations • Shoulder joint: • Humeral head and glenoid fossa of scapula

  4. Figure 5.7 Anterior/posterior connections? Same/different than hip girdle?

  5. Agenda • Introduction to the shoulder complex • Articulations of the shoulder complex • Scapulohumeral rhythm

  6. Articulations of the Shoulder Complex • Shoulder girdle: • Acromioclavicular joint • Sternoclavicular joint • Shoulder joint

  7. Acromioclavicular (AC) Joint • Joint classification: Diarthrodial nonaxial • Joint structure: • Ligamentous reinforcement • Fibrocartilage disk • Joint function: • Rotation about 3 cardinal planes

  8. Gliding in which plane? Rotation in which plane? Rotation in which plane? Rotation in which plane?

  9. Sternoclavicular (SC) Joint • Joint classification: Diarthrodial nonaxial • Joint structure: • Ligamentous reinforcement • Fibrocartilage disk • Subclavius • Joint function: • SC joint moves in response to AC joint movement • Movements?

  10. SC Joint • AC elevation  SC elevation • AC depression  SC depression • AC protraction  SC protraction + anterior rotation • AC retraction  SC retraction + posterior rotation

  11. Shoulder Joint • Joint classification: Diarthrodial multiaxial ball and socket • Joint structure: • Lax joint capsule • Limited ligamentous support • Shallow glenoid fossa • Minimal muscular reinforcement • Rotator cuff • Bursae • Joint function: • Great mobility  Poor stability

  12. Agenda • Introduction to the shoulder complex • Articulations of the shoulder complex • Scapulohumeral rhythm

  13. Scapulohumeral Rhythm • As the shoulder joint moves, the shoulder girdle also moves  greater ROM

  14. Scapulohumeral Rhythm • Abduction/Flexion of shoulder joint • AC = Up Rot., SC = Post Rot., elevation • Adduction/Extension of shoulder joint • AC = Down Rot., SC = Ant Rot, depression • Hyperextension of shoulder joint • AC = Up tilt, elevation, SC = Ant Rot, elevation • External rotation of humeral joint • AC = Retraction, SC = Minimal retraction • Internal rotation of humeral joint • AC = Protraction, SC = Minimal protraction • Horizontal adduction of humeral joint • AC = Protraction, SC = Protraction • Horizontal abduction of humeral joint • AC = Retraction, SC = Retraction