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What is the AC joint?  The AC joint is a plane synovial joint formed between the acromion of the scapula (shoulder blade) and the distal end of the clavicle (collarbone), on top of the shoulder.  The joint is stabilised by the acromioclavicular (AC) ligaments, coracoclavicular (CC) ligaments and the coracoacromial (CA) ligament (Kiel & Kaiser, 2020). This joint is...