2024年11月4日 · An acromioclavicular joint injury, otherwise known as a shoulder separation, is a traumatic injury to the acromioclavicular (AC) joint with disruption of the acromioclavicular ligaments and/or coracoclavicular (CC) ligaments. Diagnosis is made with bilateral focused shoulder radiographs to assess for AC and CC interval widening.

The joint is stabilized by a capsule and ligaments, and injury occurs when these structures are damaged. When the capsule and ligaments are injured, the joint can become unstable and painful, and shoulder function can be affected. This type of injury is referred to as an “AC joint sprain” or a “separation.”

2023年5月11日 · What is an AC joint sprain/separation? An Acromioclavicular joint sprain is a tear (or stretching) of the ligaments which hold the clavicle bone to the top of the shoulder blade. The acromioclavicular joint is formed by the outer end of the clavicle (collar bone), and the acromion process of the scapular (shoulder blade).

2017年3月1日 · Shoulder ligament tears typically occur between the acromion and collarbone, also referred to as the acromion-clavicular joint (AC joint). This sprain is frequently called a ‘shoulder separation’. The acromion-clavicular ligament and coracoclavicular ligament support the acromion-clavicular joint.

A complete AC joint tear or rupture of both main ligaments defines a grade 3 AC joint sprain or shoulder separation. With severe pain, tenderness, and swelling of the shoulder, moving the shoulder becomes quite difficult.

The most severe shoulder separation completely tears both the AC and CC ligaments and puts the AC joint noticeably out of position, with a larger bump. The injury is easy to identify when it causes deformity. When there is less deformity, the location of pain and X-rays help the doctor make the diagnosis.

2022年9月24日 · Acromioclavicular (AC) joint injuries are common shoulder injuries, comprising over 40% of all shoulder injuries and frequently occurring during sports, falls, or car accidents. These injuries range in severity from mild sprains to severe disruptions that can result in significant loss of shoulder strength and function.

Type I: the AC ligament is slightly torn, but there's no damage to the CC ligament is unharmed. Type II: the AC ligament is completely torn, and there's little or no tear to the CC ligament.

The sternoclavicular (SC) joint connects the collarbone (clavicle) to the breastbone (sternum). At the other end of the collarbone, the acromioclavicular (AC) joint connects the clavicle to the acromion, the highest point of the shoulder blade.

Acromioclavicular (AC) joint injury is a frequent diagnosis after an acute shoulder trauma – often found among athletes and people involved in contact sports. This injury occurs five times more frequently in men than in women, with the highest incidence in the 20- to 30-year-old age group.