Case study: Acromioclavicular joint arthritis - Injection - NYSORA

Explore NYSORA knowledge base for free:

Case study: Acromioclavicular joint arthritis – Injection

February 1, 2024

A 65-year-old female manual laborer presents with a 4-month history of left shoulder pain. She complains of anteromedial shoulder pain exacerbated during external rotation and superior shoulder pain, particularly at night.

Physical examination

  • Painful arc present
  • Tender acromioclavicular joint
  • Scarf test: Positive
  • O’Brien’s test: Positive



  • Acromioclavicular (AC) joint space narrowing
  • Capsular distension
  • Osteophyte

Transverse view of the AC joint space showing space narrowing, capsular distension, and an osteophyte.


  • Rotator cuff arthropathy
  • AC joint arthritis

X-ray image of the left shoulder.


The patient was diagnosed with AC joint arthritis. This condition is caused by deterioration of the cartilage in the AC joint due to frequent stress on the joint, commonly seen in the middle-aged population. Patients usually experience pain and tenderness at the top of the shoulder across the joint.

Discover more about the treatment strategy, patient outcome, and other unique case studies in the US Pain App. Ready to expand your knowledge? Click HERE and get the ultimate app for chronic pain procedures.

More news