Doctor evaluating patient symptoms for Acromioclavicular Joint Arthritis diagnosis at Mountain Spine & Orthopedics
Condition/Condition Details

Acromioclavicular Joint Arthritis

AC joint arthritis causes focal pain at the top of the shoulder where the collarbone meets the shoulder blade.

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About Acromioclavicular Joint Arthritis

Acromioclavicular (AC) joint arthritis affects the small joint between the clavicle and the acromion at the top of the shoulder. Because this joint is small and superficial, symptoms can be very focal: patients often point directly to the top of the shoulder rather than the side of the upper arm.

AC joint arthritis may develop after years of lifting, overhead work, bench pressing, contact sports, or a prior AC separation. It can also coexist with rotator cuff disease, biceps tendon pain, or neck pain, so Mountain Spine & Orthopedics evaluates the entire shoulder before assuming the AC joint is the only pain generator.

What Are the Symptoms of Acromioclavicular Joint Arthritis?

Common symptoms include:

  • Point tenderness at the top of the shoulder
  • Pain reaching across the chest, such as using a seat belt or washing the opposite shoulder
  • Pain with bench press, push-ups, overhead lifting, or sleeping on that side
  • Visible prominence, swelling, or enlargement over the AC joint
  • Clicking or grinding at the top of the shoulder
  • Less commonly, pain that overlaps with rotator cuff or cervical spine symptoms
Acromioclavicular Joint Arthritis
AC joint arthritis causes focal pain at the top of the shoulder where the collarbone meets the shoulder blade.

Are There Specific Risk Factors for Acromioclavicular Joint Arthritis?

Risk factors include prior AC joint separation, repeated heavy lifting, bench press and overhead training, contact sports, occupational overhead work, age-related cartilage loss, bone spurs, and shoulder mechanics that increase load across the top of the shoulder.

Diagnosing Acromioclavicular Joint Arthritis?

Diagnosis is based on focal tenderness, cross-body adduction pain, AC joint stress testing, and comparison with rotator cuff and neck exam findings. X-rays can show joint narrowing, spurs, cystic changes, or old separation. MRI may reveal AC joint inflammation and also identify coexisting rotator cuff, biceps, or labral pathology.

A precisely placed diagnostic injection into the AC joint can help confirm whether that small joint is the main pain source. Complimentary MRI reviews are available for patients with prior imaging.

Treatment for Acromioclavicular Joint Arthritis?

Non-Surgical Treatment Options

Initial treatment may include activity modification, avoiding painful cross-body and heavy pressing positions, anti-inflammatory medication when appropriate, and outside rehabilitation guidance to improve shoulder mechanics.

Injection or Surgical Treatment

Image-guided corticosteroid injection into the AC joint can be both diagnostic and therapeutic. If focal AC joint pain persists despite appropriate care, arthroscopic distal clavicle excision, often called a Mumford procedure, may be considered to remove painful bone-on-bone contact while preserving shoulder function.

Does Acromioclavicular Joint Arthritis Cause Pain?

AC joint arthritis pain is usually easy to localize but easy to confuse with other shoulder problems when rotator cuff or neck symptoms coexist. Pain centered on the top of the shoulder and triggered by cross-body reach is a useful clue that the AC joint should be tested directly.

What Can Patients Do to Prevent It?

Preventing AC joint arthritis involves protecting the joint and addressing injuries early:

  • Seek prompt treatment for AC joint injuries to prevent arthritis
  • Avoid repetitive overhead activities without proper rest
  • Use proper lifting techniques and body mechanics
  • Strengthen shoulder and scapular stabilizer muscles
  • Address early symptoms promptly with rest and evaluation
  • Maintain shoulder flexibility through regular exercise

Schedule a Consultation Today

If top-of-shoulder pain is limiting lifting, sleep, sport, or cross-body reach, schedule a consultation with Mountain Spine & Orthopedics. Prior imaging can be reviewed to confirm whether the AC joint is the primary source.

Locations Offering Evaluation

Our board-certified specialists offer acromioclavicular joint arthritis evaluation and treatment at locations across Florida, New Jersey, New York, and Pennsylvania. Schedule a consultation at a clinic near you.

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Frequently Asked Questions

What is AC joint arthritis?

Acromioclavicular (AC) joint arthritis is degeneration of the small joint at the top of the shoulder where the collarbone meets the acromion. It results from age-related wear, previous AC separation, or repetitive overhead stress in athletes (weightlifters, swimmers).

What are the symptoms of AC joint arthritis?

Symptoms include localized pain at the top of the shoulder, tenderness directly over the AC joint, pain worsening when reaching across the body or sleeping on the affected side, and clicking or grinding with shoulder movement.

How is AC joint arthritis diagnosed?

Cross-body adduction test reproduces pain by bringing the arm across the chest. X-rays show joint space narrowing, bone spurs, and sometimes upward clavicle migration. Diagnostic lidocaine injection into the joint confirms the pain source.

Can AC joint arthritis be treated without surgery?

Yes, most cases respond to activity modification, NSAIDs, and rehabilitation strengthening rotator cuff muscles. Corticosteroid injections provide temporary relief. Avoiding overhead activities and sleeping on the opposite side reduces symptoms.

When is surgery needed for AC joint arthritis?

Surgery (distal clavicle excision) is considered when conservative treatment fails after 3-6 months and pain significantly limits activities. The procedure removes 5-10mm of the clavicle end, creating space and eliminating painful bone contact.