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Acromial types

The shape of the acromion had been initially divided into 3 types (which was known as the Bigliani classification 3), to which a fourth has been added 2.

Acromion morphology based on sagittal oblique MRI
  1. flat inferiorly
  2. curved - parallel to the humeral head with convex undersurface - considered commonest type 3
  3. hooked - the most anterior portion of the acromion has a hooked shape, associated with increased incidence of shoulder impingement
  4. convex (upturned) - 
    • this is the most recent classification of acromion process.
    • the undersurface of the acromion is convex near the distal end4.
    • no convincing correlation between a type 4 acromion and impingement syndrome exists4-5

See also


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Upper limb anatomy

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