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Supraspinatus outlet view X-ray, showing subacromial space measurement. The normal subacromial space in shoulder radiographs is 9–10 mm; this space is significantly greater in men, with a slight reduction with age. [2]
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.
Shoulder anatomy, front view Shoulder anatomy, back view. The rotator cuff is an anatomical term given to the group of four muscles and their tendons that act to stabilize the shoulder. [3] These muscles are the supraspinatus, infraspinatus, teres minor and subscapularis and that hold the head of the humerus in the glenoid cavity during ...
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]
The infraspinatus and supraspinatus [13] tests have a specificity of 80% to 90%. [ 10 ] A common cause of shoulder pain in rotator cuff impingement syndrome is tendinosis , which is an age-related and most often self-limiting condition.
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]
The supraspinous fascia completes the osseofibrous case in which the supraspinatus muscle is contained; it affords attachment, by its deep surface, to some of the fibers of the muscle. It is thick medially, but thinner laterally under the coracoacromial ligament .