Source: jxradiology
Most of the literature is divided into 3 types according to Bigiliani's proposed shoulder segmentation: flat shoulder, curved shoulder, and hooked shoulder.
Type I (flat type) accounted for 18.4%,
Type II (curved type) accounted for 52.6%,
Type III (hook type) accounted for 29.0%.
Type IV: Convex or upturned.
Oblique sagittal T1WI like 4 types of acromion diagram:
The shape of the acromion has been initially divided into 3 types (which was known as the Bigliani classification), to which a fourth has been added:
1. flat inferiorly
2. curved - parallel to the humeral head with convex undersurface - considered commonest type
3. hooked - the most anterior portion of the acromion has a hooked shape ,associated with increase incidence of shoulder impingement
4. convex (upturned )
this is the most recent classification of acromion process
in this type of acromion, the undersurface is convex near the distal end
no convincing correlation between a type 4 acromion and impingement syndrome exists
Acromial typing of the outlet x-ray of the upper muscle of the gang:
Schematic diagram of subacromial impact and rotator cuff tearing:
Anatomical abnormality in the shape of the acromion or degeneration with formation of spurs on the underside of the ACJ can lead to the tendon rubbing painfully against these structures, leading to inflammation within the bursa and tendon and possibly to eventual tendon damage and rupture.
Anatomical acroachronics or bone spur formation below the acromioclavicular joint (ACJ) can cause tendons to painfully rub these structures, leading to inflammation in the bursa and tendons, and may eventually lead to tendon injury and tearing.
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