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. Anterior/posterior connections? Same/different than hip girdle?
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. Rotation in which plane?
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?

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

12. 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

14. Agenda Introduction to the shoulder complex
Articulations of the shoulder complex
Scapulohumeral rhythm

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

16. 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