Acromial keel spur
Rotator cuff syndrome.
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AC joint osteoarthritis and severe supraspinatus tendinosis. There is an oblong spur at the acromial insertion of the coracoacromial ligament directed antero-medially and inferiorly.
A subacromial keel is a spur on the anterior under-surface of the acromion, that is formed like the keel of a sailboat. It is highly associated with rotator cuff damage and tear1.