ACROMIAL APOPHYSIOLYSIS OR APOPHYSITIS MRI FINDINGS
WHAT IS ACROMIAL APOPHYSIOLYSIS
- Acromial apophysiolysis or acromial apophysitis is a Stress injury due to repetitive traction injury at the acromial apophysis.
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- It results in instability at the apophysis and shoulder pain.
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- People who have acromial apophysitis have a higher incidence of eventually developing an Os Acromiale.
- The acromion develops from 3 apophyses which progressively fuse by age 25.
- Â <25yo unfused apophysis is normal but there should be no bone marrow oedema around the apophysis.
- Â If >25yo and apophysis is unfused unfused = Os Acromiale. (Discussed this and how to find it in a previous post you can see HERE
3 MRI FINDINGS IN ACROMIAL APOPHYSIOLYSIS
- The apophysis has to be unfused.
 - Oedema on both sides of the apophysis.
 - +/- Cystic type change and cortical irregularity subjacent to growth plate.
- It’s normal to see an unfused apophysis until 18-25yo.
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- But there should be no oedema, cortical irregularity or subcortical cyst formation.
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- If present, these are signs of instability and apophysiolysis.
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See the images below for what the MRI appearance of Acromial Apophysiolisis looks like.
ACROMIAL APOPHYSIOLYSIS OR APOPHYSITIS: VIEW IMAGES
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