Posterior shoulder dislocation

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Background

  • Via forceful internal rotation/adduction (sz, electric shock) or blow to ant shoulder
  • Neurovascular and rotator cuff tears are less common than in ant dislocations

Clinical Features

  • Prominence of posterior shoulder and ant flattening of normal shoulder contour
  • Pt unable to rotate or abduct affected arm

Diagnosis

Imaging

  • Scapular "Y" view shows humeral head in posterior position

Differential Diagnosis

Management

  • Reduce
    • Traction applied to adducted arm in long axis of humerus
    • Assistant pushes humeral head anteriorly into glenoid fossa
  • Spling, ortho f/u

References