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AC Joint Osteoarthritis: Causes, Symptoms & Treatment

AC joint osteoarthritis is a degenerative condition of the acromioclavicular joint, causing shoulder pain and limited mobility. It is common in older adults and athletes.

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Things worth knowing about "AC joint osteoarthritis"

AC joint osteoarthritis is a degenerative condition of the acromioclavicular joint, causing shoulder pain and limited mobility. It is common in older adults and athletes.

What is AC Joint Osteoarthritis?

AC joint osteoarthritis (also known as acromioclavicular joint osteoarthritis or AC joint arthrosis) is a degenerative condition affecting the acromioclavicular joint – the joint that connects the shoulder blade (acromion) to the collarbone (clavicle). Over time, the protective cartilage in this joint breaks down, leading to pain, inflammation, and reduced shoulder mobility. It is one of the most frequent causes of shoulder pain, particularly in older adults and athletes involved in overhead or heavy lifting activities.

Causes

AC joint osteoarthritis typically develops due to a combination of factors:

Age-related wear and tear: Natural deterioration of cartilage occurs as part of the aging process.
Mechanical overload: Heavy physical labor, weightlifting, or high-impact sports (e.g., wrestling, rugby) place excessive stress on the joint.
Previous injuries: Past shoulder trauma, such as AC joint separations, can accelerate cartilage breakdown.
Inflammatory conditions: Rheumatoid arthritis and other joint diseases can contribute to the development of osteoarthritis.
Genetic predisposition: A family history of osteoarthritis increases the risk of developing the condition.

Symptoms

Common symptoms of AC joint osteoarthritis include:

Pain at the top of the shoulder, especially when lifting the arm above shoulder height
Pain when crossing the arm across the body (positive cross-body adduction test)
Tenderness directly over the AC joint
Swelling or visible prominence at the shoulder tip
Clicking, grinding, or crepitation during shoulder movement
Reduced range of motion, particularly with overhead activities

Diagnosis

The diagnosis of AC joint osteoarthritis is established through several assessments:

Physical examination: The physician palpates the joint and assesses pain response during specific movements.
X-ray imaging: Reveals classic signs of osteoarthritis such as joint space narrowing, bone spurs (osteophytes), and subchondral sclerosis.
Ultrasound: Allows evaluation of soft tissue changes and signs of inflammation.
MRI (Magnetic Resonance Imaging): Provides detailed information on cartilage integrity, ligament status, and surrounding soft tissue.
Diagnostic injection: A local anesthetic injected into the joint can confirm the AC joint as the source of pain.

Treatment

Conservative Treatment

In most cases, AC joint osteoarthritis is initially managed with non-surgical approaches:

Physiotherapy: Targeted exercises to strengthen the shoulder muscles and improve range of motion.
Pain medication: Non-steroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen or diclofenac help reduce pain and inflammation.
Corticosteroid injections: A cortisone injection directly into the joint can effectively reduce inflammation and provide pain relief.
Cold and heat therapy: Depending on the stage of the disease, ice packs or heat applications can alleviate discomfort.
Activity modification: Avoiding aggravating movements and adapting physical activities to protect the joint.

Surgical Treatment

If conservative measures fail to provide adequate relief, surgical intervention may be considered:

Arthroscopic acromioplasty: A minimally invasive procedure to remove bone spurs and widen the joint space.
Lateral clavicle resection: Removal of a small portion of the clavicle end to eliminate friction within the joint (also known as the Mumford procedure).

Prognosis and Prevention

With appropriate treatment, the prognosis for AC joint osteoarthritis is generally favorable. Many patients achieve significant symptom relief through conservative management. Preventive strategies include regular low-impact exercise, avoiding joint overload, maintaining a healthy body weight, and supporting cartilage health through a balanced diet.

References

Mazzocca, A. D. et al.: Acromioclavicular joint injuries. In: Journal of the American Academy of Orthopaedic Surgeons, 2007.
Stenlund, B. et al.: Shoulder tendinitis and its relation to heavy manual work and exposure to vibration. In: Scandinavian Journal of Work, Environment & Health, 1993.
Deutsche Gesellschaft für Orthopädie und Orthopädische Chirurgie (DGOOC): Guidelines for the Management of Shoulder Disorders, 2022.

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