Type 1 Acromion

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The acromion contrasts in people regularly (morphological variations). These were depicted by Bigliani as type 1 acromion, type II or sort III. The sort I is level, type II is bent and type III snared. A man with a sort II or sort III acromion would be at a higher danger of impingement because of the narrowing of the acromiohumeral hole and bursal space.

Notwithstanding the abovementioned, with propelling age individuals have a tendency to build up a bone goad on the front and side of the acromion. This further diminishes the subacromial space expanding the danger of impingement.

Along these lines, someone with a rotator sleeve damage who has a sort III acromion and is their 50’s has a high danger of creating critical impingement contrasted with a patient in their 20’s supporting a supraspinatus strain who may have a sort I acromion and no goads.

The rotator sleeve and acromion will then rub against each other, causing a difficult condition known as impingement. Each time the arm is raised there is a touch of rubbing on the ligaments and the bursa between the ligaments and the acromion, which may cause torment and aggravation.

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Impingement may turn into a significant issue for a few people and bother their typical exercises. This is when treatment is required.


State of Acromion

The state of the acromion had been at first isolated into three sorts (which was known as the Bigliani characterization) 3, to which a fourth has been included 2. They are utilized as an institutionalized method for portraying the acromion, and in addition, foreseeing to a degree the frequency of impingement.



This characterization was at first proposed by Bigliani et al. in 1986 on outlet see radiographs and later changed by Kitay et al. 7 and Vanarthos et al. in 1995, which remains the most generally acknowledged grouping at the season of composing (July 2016).


Acromion morphology (types) depend on sagittal slanted MRI:

  1. Level poorly (12%)

  2. Bended (56%)

  • Parallel to the humeral head with a curved undersurface
  • Thought about most basic compose 3

      3. Snared (29%)

  • The most front bit of the acromion has a snared shape.
  • Related to an expanded rate of shoulder impingement.
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     4. Raised (upturned) (3%)

  • Latest arrangement of acromion process shape
  • The undersurface of the acromion is curved close to the distal end 4
  • No persuading relationship between’s a sort 4 acromion and impingement disorder exists


Subacromial Impingement

The four muscles that raise and lower the arm (and their particular ligaments) are by and large known as the rotator sleeve. The rotator sleeve lies under the top of the shoulder (an augmentation of the shoulder bone known as the acromion ). The space between the acromion and the rotator sleeve ligaments is filled by the subacromial bursa. This bursa is a liquid filled sac that takes into consideration smooth floating of the rotator sleeve under the acromion with overhead developments of the shoulder.

The rotator sleeve works a depressor and centralizer of the humeral head in the glenohumeral joint. As the arm is hoisted the rotator sleeve discourages the humeral head enabling it to skim effortlessly underneath the acromion.

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Should any irregularity happen to influence the rotator sleeve this would prompt brokenness of the rotator sleeve. Along these lines as the arm is raised, the discouraging and concentrating impact would be lost and the humeral head would ride upwards nearer to the acromion in danger of causing impingement.


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