What is an Acromioclavicular Joint Separation?

What Causes an Acromioclavicular Joint Separation?

Landing on the outer shoulder during cycling or contact sports suddenly loads the acromioclavicular and coracoclavicular ligaments. A mild injury stretches them, while a more severe tear can leave the outer collarbone visibly higher. Examination and shoulder X-rays help determine the grade.

Symptoms

• Sharp pain on top of the shoulder near the outer collarbone
• Swelling or a step-like prominence at the shoulder tip
• Pain when lifting the arm overhead or bringing it across the chest
• Tenderness that worsens when lying on the shoulder or wearing a bag

Frequently Asked Questions

Does an acromioclavicular separation always need surgery?

No. Low and moderate grade injuries can recover with a sling, pain control and gradual motion. Surgery may be discussed when there is marked displacement, persistent pain, weakness or a high demand for overhead work and sport, based on examination and imaging.