This site is intended for healthcare professionals

Go to /sign-in page

You can view 5 more pages before signing in


Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

Authoring team

Usually a history of a direct blow on the front of the shoulder, or forced internal rotation of the abducted arm.

On examination, the shoulder has an abnormal contour, with a bulge posteriorly. Invariably the shoulder is locked in full internal rotation - virtually pathognomonic for this condition.

Radiography shows the characteristic lightbulb sign on AP view; an axillary lateral view is needed to actually view the dislocation.

Related pages

Create an account to add page annotations

Annotations allow you to add information to this page that would be handy to have on hand during a consultation. E.g. a website or number. This information will always show when you visit this page.