Alan M. Hirahara, MD, FRCSC
Orthopaedic SurgeonSpecialist in Sports Medicine

AC Joint

The acromioclavicular joint (AC) is the articulation between the acromion and clavicle.  This joint is frequently injured from falls on to the shoulder.  These injuries are called "shoulder separations," not dislocations.  When there is minor deformity, it can frequently be treated conservatively with physical therapy.  When there is significant deformity, movement, and chronic pain, surgery is often required.  An AC separation commonly has associated pathology inside the joint like SLAP lesions or rotator cuff tears.  Persistent pain after an AC separation may not be related directly to the separation, but to the associated pathology in the joint.

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