II. Indications

  1. Evaluation for Rotator Cuff Impingement
  2. Acromioclavicular Separation
  3. Acromioclavicular Osteoarthritis

III. Findings: Acromion in Rotator Cuff Impingement

  1. Type I: Flat, smooth acromion at clavicular joint
    1. Normal subacromial space
  2. Type II: Hooked acromion
    1. Subacromial space mildly decreased
  3. Type III: Hooked acromion with spur
    1. Subacromial space significantly decreased

IV. Findings: Acromioclavicular Osteoarthritis

  1. Precaution
    1. Acromioclavicular Osteoarthritis is a common incidental finding on XRay
    2. AC degenerative findings in most patients by age 50 years
  2. Findings suggestive of significant joint Osteoarthritis
    1. Distal clavicle lysis
    2. Elevation of distal clavicle

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