The Shoulder Complex

Applied Kinesiology420:151

Agenda

Introduction to the shoulder complex

Articulations of the shoulder complex

Scapulohumeral rhythm

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

Anterior/posterior connections?

Same/different than hip girdle?

Figure 5.7

Agenda

Introduction to the shoulder complex

Articulations of the shoulder complex

Scapulohumeral rhythm

Articulations of the Shoulder Complex

Shoulder girdle: Acromioclavicular joint Sternoclavicular joint

Shoulder joint

Acromioclavicular (AC) Joint

Joint classification: Diarthrodial nonaxial

Joint structure: Ligamentous reinforcement Fibrocartilage disk

Joint function: Rotation about 3 cardinal planes

Gliding in which plane?

Rotation in which plane?

Rotation in which plane?

Rotation in which plane?

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?

SC Joint

AC elevation SC elevation AC depression SC depression AC protraction SC protraction +

anterior rotation AC retraction SC retraction +

posterior rotation

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

Agenda

Introduction to the shoulder complex

Articulations of the shoulder complex

Scapulohumeral rhythm

Scapulohumeral Rhythm As the shoulder joint moves, the

shoulder girdle also moves greater ROM

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