Acromioclavicular articulation

Acromioclavicular Articulation is a joint located at the top of the shoulder. It is formed by the junction of the acromion, a process of the scapula, and the clavicle. This joint is one of the important structures in the shoulder girdle, playing a crucial role in the movement and stability of the arm.

Anatomy

The acromioclavicular articulation is a plane type synovial joint. The articular surfaces are covered with fibrocartilage, rather than the hyaline cartilage that covers most articular surfaces. The joint is surrounded by a capsule, which is strengthened by the acromioclavicular ligament.

Function

The primary function of the acromioclavicular articulation is to allow the ability to raise the arm above the head. It is responsible for the movement of the scapula resulting in the arm's upward rotation.

Clinical Significance

Injuries to the acromioclavicular articulation, often referred to as AC joint injuries, are common in contact sports. They can result from a fall onto the shoulder, causing the acromion to move or separate from the clavicle, a condition known as acromioclavicular dislocation or shoulder separation.

Treatment

Treatment for injuries to the acromioclavicular articulation depends on the severity of the injury. Mild injuries can often be treated with rest, ice, and nonsteroidal anti-inflammatory drugs (NSAIDs). More severe injuries may require surgical intervention to repair the damaged ligaments and stabilize the joint.

See Also

• Shoulder girdle
• Scapula
• Clavicle
• AC joint injuries
• Shoulder separation