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The Shoulder Joint

The Shoulder Joint

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The Shoulder Joint

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  1. The Shoulder Joint Anatomy and Physiology of Human Movement 420:050

  2. 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

  3. Objectives • Bones, bony landmarks and joints • Muscles • Movements

  4. The Shoulder Joint • Multiaxial ball and socket joint • Able to rotate freely in all three planes • Sagittal • Frontal • Transverse

  5. Objectives • Bones, bony landmarks and joint • Muscles • Movements

  6. Deltoid

  7. Pectoralis Major

  8. Coracobrachialis

  9. Latissimus Dorsi

  10. Teres Major

  11. Rotator Cuff • Supraspinatus • Infraspinatus • Teres Minor • Subscapularis

  12. Rotator Cuff • Small muscles • Critical for shoulder health • Dynamic stabilization • Especially important during overhead repetitious activities

  13. Supraspinatus

  14. Infraspinatus

  15. Teres Minor

  16. Subscapularis

  17. Objectives • Bones, bony landmarks and joint • Muscles • Movements

  18. Movements • Flexion • Movement of humerus straight anteriorly • Extension • Movement of humerus straight posteriorly

  19. Movements • Abduction • Upward lateral movement of humerus out to the side, away from body • Adduction • Downward movement of humerus medially toward body from abduction

  20. 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

  21. 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

  22. 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

  23. LINE OF PULL

  24. FLEXION • Superior movement of the humerus in the sagittal plane

  25. Coracobrachialis

  26. FLEXION

  27. FLEXION • Anterior deltoid • Pectoralis major (upper fibers) • Coracobrachialis

  28. EXTENSION • Inferior movement of the humerus in the sagittal plane

  29. Coracobrachialis

  30. EXTENSION

  31. EXTENSION • Exception  Pectoralis Major Lower Fibers • Effective extensor from hyperflexed position

  32. EXTENSION • Latissimus dorsi • Teres major • Deltoid (posterior) • Pectoralis major (lower fibers) • From hyperflexed position

  33. ABDUCTION • Superolateral movement of the humerus in the frontal plane

  34. ?

  35. ABDUCTION

  36. 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.

  37. ABDUCTION • Deltoid (all three) • Pectoralis major (upper fibers) • Abducted > 90 degrees

  38. ADDUCTION • Inferomedial movement of the humerus in the frontal plane

  39. ADDUCTION

  40. 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.

  41. ADDUCTION • Latissimus dorsi • Teres major • Pectoralis major (lower fibers) • Pectoralis major (upper fibers) • Abducted < 90 degrees

  42. HORIZONTAL ABDUCTION • Movement of the humerus away from the midline of the body in the transverse plane

  43. HORIZONTAL ABDUCTION

  44. HORIZONTAL ABDUCTION • Deltoid (posterior) • Latissimus dorsi • Teres major • Infraspinatus • Teres minor