Acromioclavikulært

Acromioclavicular, often abbreviated as AC joint, refers to the articulation between the acromion, a part of the shoulder blade (scapula), and the distal end of the clavicle, commonly known as the collarbone. This joint is situated at the top of the shoulder, forming a connection between the shoulder girdle and the axial skeleton. The AC joint is a synovial joint, meaning it is enclosed by a capsule and contains synovial fluid, allowing for a limited range of smooth movement.

The primary function of the AC joint is to facilitate rotation of the scapula, which is crucial for overhead arm movements. It also helps to transmit forces from the upper limb to the trunk. The stability of the AC joint is maintained by several ligaments, including the acromioclavicular ligament, which directly connects the acromion and clavicle, and the stronger coracoclavicular ligaments (conoid and trapezoid ligaments), which anchor the clavicle to the coracoid process of the scapula.

Injuries to the AC joint are common, particularly in athletes involved in contact sports or activities that involve falls onto an outstretched arm. These injuries, known as AC joint separations, range in severity from mild sprains where the ligaments are stretched to complete tears where the clavicle is significantly elevated. Symptoms can include pain, swelling, and a visible deformity at the top of the shoulder. Treatment depends on the grade of the separation and may involve conservative measures like rest and physical therapy, or surgical intervention for more severe cases. Degenerative changes, such as osteoarthritis, can also affect the AC joint, leading to pain and stiffness, especially in older individuals.