Gagey jfk2011

13. Jun 2011
Gagey jfk2011
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Gagey jfk2011

Hinweis der Redaktion

  1. To understand functional anatomy of the cuff is challenging
  2. When the arm is at rest along the chest wall, there are no tensed ligaments
  3. When the arm is at rest along the chest wall, there are no tensed ligaments
  4. When the arm is at rest along the chest wall, there are no tensed ligaments
  5. When the arm is at rest along the chest wall, there are no tensed ligaments
  6. Tension of the glenohumeral ligaments occurs only above 60° elevation. Note in addition that ther are no landmark to differentiate middle from inferior glenohumeral ligaments.
  7. Obviously the labrum and the vacuum phenomenon play a role in stabilizing the joint but we should assume that it of poor importance.
  8. The biomechanical challenge is also provided by the absence of congruence between the joint surfaces how to stabilize an orange in the front of a vertical dishe?
  9. The coracoacromial arch is in close contact of the upper end of the humerus even in anatomic specimens (ie in absence of any muscle contraction), this is due to the vacuum phenomenon.
  10. The coracohumeral ligament is equiped with proprioception receptors (accordin Golcke) this indicates that the ligament is involved in the control of movement.
  11. The CA arch provides additional control in a second direction.
  12. To understand the stabilization mechanism we should consider two cuff working aroune the humeral head
  13. The first one is a pulling cuff with four powerful muscles, the second one is the deltoideus
  14. The anterosuperior fibrous lock is oh high importance. It includes the upper tendon of subscapularis, the anterior part of the supraspinatus tendon, thelong part of biceps brachialis the superior glenohumeral ligmanent and the coracohumeral ligament. The deltopectoral approach weakens the fibrous lock which failure leads, for instance, to the migration of the prosthetic head.
  15. The rotator cuff includes four muscles with a complex deep fibrous structure inside that changes the mechanical properties : increased strenght and shorter course
  16. The rotator cuff includes four muscles with a complex deep fibrous structure inside that changes the mechanical properties : increased strenght and shorter course
  17. The cuff has two functions : on one hand to pull the head and press it agains the glenoid on the other to provide external rotation
  18. Lateral rotation contributes a great deal to the elevation of the hand,
  19. The deltoideus wraps itself around the upper end of the humerus this is true from the beginning of the elevation until 60°
  20. The middle part of the deltoideus has strong fibrous bands. No such bands exist in the anterior nor in the posterior deltoideus.
  21. Middle deltoideus is a multipennate muscle (high strenght with short course), this part of the muscle is the main elevator of the humerus The contraction of the deltoideus crates an « inflatable cuff » around the upper end of the humerus
  22. The resultant deltoideus force allied to the upper end of the humerus pushes the head downward whereas it pulls the humeral shaft upwards. This was demonstrated by Duchenne de Boulogne at the end of the eighteen century
  23. The resultant deltoideus force allied to the upper end of the humerus pushes the head downward whereas it pulls the humeral shaft upwards. This was demonstrated by Duchenne de Boulogne at the end of the eighteen century
  24. The resultant deltoideus force allied to the upper end of the humerus pushes the head downward whereas it pulls the humeral shaft upwards. This was demonstrated by Duchenne de Boulogne at the end of the eighteen century
  25. The resultant deltoideus force allied to the upper end of the humerus pushes the head downward whereas it pulls the humeral shaft upwards. This was demonstrated by Duchenne de Boulogne at the end of the eighteen century
  26. The resultant deltoideus force allied to the upper end of the humerus pushes the head downward whereas it pulls the humeral shaft upwards. This was demonstrated by Duchenne de Boulogne at the end of the eighteen century
  27. The resultant deltoideus force allied to the upper end of the humerus pushes the head downward whereas it pulls the humeral shaft upwards. This was demonstrated by Duchenne de Boulogne at the end of the eighteen century
  28. The resultant deltoideus force allied to the upper end of the humerus pushes the head downward whereas it pulls the humeral shaft upwards. This was demonstrated by Duchenne de Boulogne at the end of the eighteen century
  29. The resultant deltoideus force allied to the upper end of the humerus pushes the head downward whereas it pulls the humeral shaft upwards. This was demonstrated by Duchenne de Boulogne at the end of the eighteen century
  30. The resultant deltoideus force allied to the upper end of the humerus pushes the head downward whereas it pulls the humeral shaft upwards. This was demonstrated by Duchenne de Boulogne at the end of the eighteen century
  31. The resultant deltoideus force allied to the upper end of the humerus pushes the head downward whereas it pulls the humeral shaft upwards. This was demonstrated by Duchenne de Boulogne at the end of the eighteen century
  32. The resultant deltoideus force allied to the upper end of the humerus pushes the head downward whereas it pulls the humeral shaft upwards. This was demonstrated by Duchenne de Boulogne at the end of the eighteen century
  33. The resultant deltoideus force allied to the upper end of the humerus pushes the head downward whereas it pulls the humeral shaft upwards. This was demonstrated by Duchenne de Boulogne at the end of the eighteen century
  34. The deltoideus acts on the humerus through the subdeltoid bursa. A painfull bursa may be responsible of inhibition of the middle deltoideus that explains mainy cases of pseudoparalytic shoulders.
  35. The deltoideus acts on the humerus through the subdeltoid bursa. A painfull bursa may be responsible of inhibition of the middle deltoideus that explains mainy cases of pseudoparalytic shoulders.
  36. The deltoideus acts on the humerus through the subdeltoid bursa. A painfull bursa may be responsible of inhibition of the middle deltoideus that explains mainy cases of pseudoparalytic shoulders.
  37. Ther is a true joint organisation under the deltoideus as emphasized by De Sèze (the fifth joint of the shoulder) with full congruency, synovial tissue and mechanoreceptors.
  38. Ther is a true joint organisation under the deltoideus as emphasized by De Sèze (the fifth joint of the shoulder) with full congruency, synovial tissue and mechanoreceptors.