Last revised by Dr Henry Knipe on 20 Mar 2020

The acromion (plural: acromia), also known as the acromial process, is a small projection of the scapula that extends anteriorly from the spine of the scapula. 

It forms the acromioclavicular joint (ACJ) with the lateral third of the clavicle and also connects with the coracoid process via the coracoacromial ligament.

There are a number of acromial types, which reflect the inferior surface shape of the acromion 1:

  • type 1: flat acromion
  • type 2: curved acromion
  • type 3: hooked acromion
  • type 4: convex

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