What is the Anatomy of the AC Joint?
The acromioclavicular (AC) joint is located where the clavicle (collarbone) meets the highest point of the acromion (shoulder blade). The AC joint is held closely together by multiple ligaments and wrapped in cartilage at the end of each bone. An AC joint injury is a common shoulder condition generally caused by a hard fall or blunt force to the joint. Dr. Matthew Provencher, shoulder specialist serving the Vail, Aspen, Colorado Springs, and Denver, Colorado communities, can help alleviate acromioclavicular joint pain after an injury and return patients to an active, healthy lifestyle.
The most common cause of an AC joint injury is a direct contact force impacting the top of the shoulder. The fall can cause the joint to experience a mild sprain or, in cases of a particularly forceful impact, a complete shoulder separation. An AC joint injury is measured in multiple grades, spanning from Grade 1 as a mild sprain up to Grade 6 as a debilitating and complete disruption resulting in a total AC joint separation.
What are the Symptoms of an AC Joint Injury?
The hallmark sign of an AC joint injury is pain from palpation at the AC joint. Acromioclavicular joint pain ranges from mild tenderness to sharp, intense pain following injury. The pain is commonly felt at the top of the shoulder. Patients may also experience bruising, swelling, a visible deformity and a popping sensation in higher grade injuries.
How to Diagnose an AC Joint Injury?
A complete physical examination of the shoulder and a series of x-rays performed by Dr. Provencher will lead to a confirmed AC joint injury diagnosis. An x-ray can also help rule out any additional injuries to the bone, such as a fracture of the end of the collarbone. In addition to x-ray, Dr. Provencher also performs an MRI scan to determine the injury grade and assess injury of surrounding ligaments in order to arrive at an effective and individualized treatment plan.