Definition: The acromioclavicular joint, also known as the acromioclash or acromioclash joint, is a joint between two humeral bones (the shoulder) and the clavicles (the scapula), which are attached to each other at the upper end of the neck. It is one of the three major joints in the human body that enables the movement of the arms. The acromioclavicular joint is characterized by its triangular shape, where the two humeral bones meet with the clavicles, and its deep groove (or fossa) between them. The acromioclavicular joint plays a key role in the motion of the shoulder, as it allows for the transfer of weight from the shoulder to the arm. The definition of "acromioclavicular" is not entirely clear as some sources use "acromiaric," which refers to the joint between two humeral bones and a clavicle. However, based on the context in which it is used, it would be more accurate to use the term "acromioclavicular."

acromioclavicular