Posterior Shoulder Dislocations

Question 1

Aetiology of posterior shoulder fracture?

Answer 1

Posterior force on adducted arm

Question 2

Signs & symptoms of posterior shoulder dislocations?

Answer 2

Humeral head may be palpated posteriorly

Question 3

Investigation of posterior shoulder dislocations?

Answer 3

• “Light bulb” sign on AP X-ray
• Special lateral X-rays assist diagnosis
• Radiographic findings less obvious

Question 4

What is the light bulb sign?

Answer 4

Excessively internally rotated humeral head looks symmetrical

Question 5

Treatment of posterior shoulder dislocations?

Answer 5

Closed reduction & immobilization

Physiotherapy