Abstract

In contrast to the small size and area of the acromioclavicular (AC) joint, it nevertheless plays a major role in the function of the upper extremity and the stability of the shoulder girdle. In addition to the AC joint capsule and its ligaments, of which its superior and posterior parts are primarily allocated a horizontal-stabilizing function, the coracoclavicular (CC) ligaments that provide vertical and horizontal stability have been described as one of the most relevant factors in AC joint function and stability [1–3]. Musculotendinous structures, often referred to as the deltotrapezoidal fascia, are named as dynamic stabilizers; however, neither their structure nor their influence on AC joint stability is known thoroughly.

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