AHmedabad, abduction of arm

Attachments:

  • Anterior:
    • Origin: Anterior border, superior surface and lateral 1/3 of clavicle
    • Insertion: Deltoid tuberosity of the humerus
  • Middle:
    • Origin: Lateral margin and superior surface of acromion
    • Insertion: Deltoid tuberosity of the humerus .
  • Posterior:
    • Origin: Inferior lip of the posterior border of the spine of the scapulae .
    • Insertion: Deltoid tuberosity of the humerus .

 

Arthrokinematics:                                                                                     Shoulder arthrokinematics , Deltoid

  • Shoulder: All three head of the deltoids may contribute to superior glide of the humeral head on the glenoid fossa. The considerable force vector for superior translation created by the deltoid, which adds greater significance to the inferior glide and role of the infraspinatus, teres minor, subscapularis and potentially supraspinatus in stabilizing the glenohumeral joint during elevation of the arm.

 

  • Shoulder pain patients has arthrokinematic dysfunction that included excessive inferior and anterior glide . This can be the result of prime mover inhibition of the anterior and middle deltoid . There is a relative increase in activity and the development of trigger points in the posterior deltoid. which can lead to resulting in an increase in anterior glide.

 

Contribution to Eccentric work :

  • Anterior deltoid : Shoulder extension, horizontal abduction, external rotation and will decelerate adduction when working synergy with the middle and posterior deltoid.
  • Middle deltoid : Adduction
  • Posterior deltoid : Shoulder horizontal adduction, extension, internal rotation and it may help in decelerating adduction when working in synergy with the middle and anterior deltoid.

 Synergistic :

  • The posterior deltoid may become synergistically dominant for the infraspinatus and teres minor in those who have Upper Body Dysfunction . It is thought that the lengthened position of the infraspinatus and teres minor

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