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The osseous margins of the coraco-acromial arch and hence the supraspinatus outlet canal. The shape of the acromion; This projection has a low tolerance for errors and accordingly needs proper execution. [17] The Y-projection can be traced back to Wijnblath's 1933 published cavitas-en-face projection. [18]
Abduction is carried out by the deltoid and the supraspinatus in the first 90 degrees. From 90-180 degrees it is the trapezius and the serratus anterior. Adduction is carried out by the pectoralis major, latissimus dorsi, teres major and the subscapularis. Horizontal abduction and horizontal adduction of the shoulder (transverse plane)
The osseous margins of the coraco-acromial arch and hence the supraspinatus outlet canal; The shape of the acromion; This projection has a low tolerance for errors and, accordingly, needs proper execution. [26] The Y-projection can be traced back to Wijnblath’s 1933 published cavitas-en-face projection. [27]
When the arm is raised, the subacromial space (gap between the anterior edge of the acromion and the head of the humerus) narrows; the supraspinatus muscle tendon passes through this space. [6] Anything that causes further narrowing has the tendency to impinge the tendon and cause an inflammatory response, resulting in impingement syndrome.
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The role of the supraspinatus is to resist downward motion, both while the shoulder is relaxed and carrying weight. [28] Supraspinatus tears usually occurs at its insertion on the humeral head at the greater tubercle. Though the supraspinatus is the most commonly injured tendon in the rotator cuff, the other three can also be injured at the ...
The greater tubercle of the humerus is the outward part the upper end of that bone, adjacent to the large rounded prominence of the humerus head. It provides attachment points for the supraspinatus, infraspinatus, and teres minor muscles, three of the four muscles of the rotator cuff, a muscle group that stabilizes the shoulder joint.
The supraspinatus muscle performs abduction of the arm, and pulls the head of the humerus medially towards the glenoid cavity. [5] It independently prevents the head of the humerus from slipping inferiorly. [5] The supraspinatus works in cooperation with the deltoid muscle to perform abduction, including when the arm is in an adducted position. [5]