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The Shoulder Joint. Anatomy and Physiology of Human Movement 420:050. The Shoulder Joint. Glenohumeral joint Very mobile but unstable Glenoid fossa Some ligaments Lax until extreme ROM Labrum and rotator cuff Relationship with shoulder girdle. Objectives.

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the shoulder joint

The Shoulder Joint

Anatomy and Physiology of Human Movement

420:050

the shoulder joint2
The Shoulder Joint
  • Glenohumeral joint
  • Very mobile but unstable
    • Glenoid fossa
    • Some ligaments
      • Lax until extreme ROM
    • Labrum and rotator cuff
  • Relationship with shoulder girdle
objectives
Objectives
  • Bones, bony landmarks and joints
  • Muscles
  • Movements
the shoulder joint5
The Shoulder Joint
  • Multiaxial ball and socket joint
  • Able to rotate freely in all three planes
    • Sagittal
    • Frontal
    • Transverse
objectives7
Objectives
  • Bones, bony landmarks and joint
  • Muscles
  • Movements
rotator cuff
Rotator Cuff
  • Supraspinatus
  • Infraspinatus
  • Teres Minor
  • Subscapularis
rotator cuff14
Rotator Cuff
  • Small muscles
  • Critical for shoulder health
    • Dynamic stabilization
  • Especially important during overhead repetitious activities
objectives19
Objectives
  • Bones, bony landmarks and joint
  • Muscles
  • Movements
movements
Movements
  • Flexion
    • Movement of humerus straight anteriorly
  • Extension
    • Movement of humerus straight posteriorly
movements21
Movements
  • Abduction
    • Upward lateral movement of humerus out to the side, away from body
  • Adduction
    • Downward movement of humerus medially toward body from abduction
movements22
Movements
  • Horizontal adduction
    • Movement of humerus in a horizontal or transverse plane toward & across chest
  • Horizontal abduction
    • Movement of humerus in a horizontal or transverse plane away from chest
movements23
Movements
  • External rotation
    • Movement of humerus laterally around its long axis away from midline
  • Internal rotation
    • Movement of humerus medially around its long axis toward midline
movements24
Movements
  • Diagonal abduction
    • Movement of humerus in a diagonal plane away from midline of body
  • Diagonal adduction
    • Movement of humerus in a diagonal plane toward midline of body
flexion
FLEXION
  • Superior movement of the humerus in the sagittal plane
flexion29
FLEXION
  • Anterior deltoid
  • Pectoralis major (upper fibers)
  • Coracobrachialis
extension
EXTENSION
  • Inferior movement of the humerus in the sagittal plane
extension34
EXTENSION
  • Exception  Pectoralis Major Lower Fibers
  • Effective extensor from hyperflexed position
extension35
EXTENSION
  • Latissimus dorsi
  • Teres major
  • Deltoid (posterior)
  • Pectoralis major (lower fibers)
    • From hyperflexed position
abduction
ABDUCTION
  • Superolateral movement of the humerus in the frontal plane
slide39

The location of the line of pull in relation to the joint center determines the movement in this case

Hamilton, N. & Luttgens, K. (2007). Kinesiology: Scientific basis of human motion (11th ed.). McGraw-Hill: New York.

abduction40
ABDUCTION
  • Deltoid (all three)
  • Pectoralis major (upper fibers)
    • Abducted > 90 degrees
adduction
ADDUCTION
  • Inferomedial movement of the humerus in the frontal plane
slide45

The location of the line of pull in relation to the joint center determines the movement in this case

Hamilton, N. & Luttgens, K. (2007). Kinesiology: Scientific basis of human motion (11th ed.). McGraw-Hill: New York.

adduction46
ADDUCTION
  • Latissimus dorsi
  • Teres major
  • Pectoralis major (lower fibers)
  • Pectoralis major (upper fibers)
    • Abducted < 90 degrees
horizontal abduction
HORIZONTAL ABDUCTION
  • Movement of the humerus away from the midline of the body in the transverse plane
horizontal abduction50
HORIZONTAL ABDUCTION
  • Deltoid (posterior)
  • Latissimus dorsi
  • Teres major
  • Infraspinatus
  • Teres minor
horizontal adduction
HORIZONTAL ADDUCTION
  • Movement of the humerus towards the midline in the transverse plane
horizontal adduction54
HORIZONTAL ADDUCTION
  • Pectoralis major (upper and lower)
  • Deltoid (anterior)
  • Coracobrachialis
internal rotation
INTERNAL ROTATION
  • Movement of the humerus towards the midline in the transverse plane along its long axis
internal rotation59
INTERNAL ROTATION
  • Pectoralis major (upper and lower)
  • Latissimus dorsi
  • Subscapularis
  • Teres major
external rotation
EXTERNAL ROTATION
  • Movement of the humerus away from the midline in the transverse plane along its long axis
external rotation63
EXTERNAL ROTATION
  • Supraspinatus
  • Teres minor