What is the function of the coracoacromial ligaments?

The coracoacromial ligaments play a vital role in maintaining shoulder stability, specifically by limiting superior translation of the humeral head. This ligament forms a protective arch over the top of the shoulder joint, created from the coracoid process of the scapula to the acromion. Its primary function is to prevent the head of the humerus from moving too far upward, which could lead to impingement or injury to the rotator cuff structures.

By serving as a static restraint, the coracoacromial ligament helps in maintaining the proper positioning of the humeral head within the glenoid cavity during arm movements. This support is crucial, especially during overhead activities, where the risk of upward displacement of the humeral head increases. Thus, the ligament contributes significantly to the overall stability of the shoulder complex.