Acromioclavicular joint
Acromioclavicular Joint
The Acromioclavicular Joint (pronounced: ak-ro-me-o-klav-ik-u-lar joint), often abbreviated as the AC joint, is a joint at the top of the shoulder. It is the junction between the acromion (part of the scapula that forms the highest point of the shoulder) and the clavicle.
Etymology
The term "Acromioclavicular" is derived from the Greek words 'akron' which means 'highest', 'meion' meaning 'less than', and 'clavicle' which is Latin for 'little key'.
Anatomy
The AC joint allows the ability to raise the arm above the head. It is a plane type synovial joint which means it is a freely movable joint. The joint is located at the outer end of the clavicle, where it attaches to the acromion of the scapula.
Related Terms
- Scapula: The shoulder blade.
- Clavicle: The collar bone.
- Acromion: The highest point of the shoulder.
- Synovial Joint: A type of joint that is surrounded by a thick flexible membrane forming a sac into which is secreted a viscous fluid that lubricates the joint.
Pathology
Injuries to the acromioclavicular joint are common in athletes and can range from a sprain to a complete disruption. The most common mechanism of injury is a fall onto the point of the shoulder. This is often seen in contact sports such as football and rugby.
See Also
External links
- Medical encyclopedia article on Acromioclavicular joint
- Wikipedia's article - Acromioclavicular joint
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