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Os acromiale

Author - Dipankar Bhattacharyya

Os Acromiale is present when the anterior portion of  the acromion has one or more separate ossicles.

Uncommon anatomical variant.

Incidence reported to be 8 % in cadaver study (JBJS-A- 2000  82-3)

Caused by failure of fusion of one or more of the ossification centres of the acromion.

Acromion is ossified from 3 centres—Preacromion (pa) Mesoacromion (msa) Metacromion (mta). These appear by age 15 and should fuse with each other and then to the Basiacromion (ba) by age 25.

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