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X-ray shoulder showing light bulb sign (left) in posterior shoulder dislocation. The image on the right was taken after reposition. The light bulb sign is a radiological finding observed on plain radiographs in the context of posterior shoulder dislocation. [1] It refers to the abnormal, rounded appearance of the humeral head, which resembles a ...
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A dislocated shoulder is a condition in which the head of the humerus is detached from the glenoid fossa. [2] Symptoms include shoulder pain and instability. [ 2 ] Complications may include a Bankart lesion , Hill-Sachs lesion , rotator cuff tear , or injury to the axillary nerve .
A Bankart lesion is a type of shoulder injury that occurs following a dislocated shoulder. [3] It is an injury of the anterior (inferior) glenoid labrum of the shoulder. [ 4 ] When this happens, a pocket at the front of the glenoid forms that allows the humeral head to dislocate into it.
A joint dislocation, also called luxation, occurs when there is an abnormal separation in the joint, where two or more bones meet. [1] A partial dislocation is referred to as a subluxation . Dislocations are commonly caused by sudden trauma to the joint like during a car accident or fall.
An injury to the AC joint will result in pain over the AC joint, in the anterolateral neck and in the region in the anterolateral deltoid. [citation needed] X-ray indicates a separated shoulder when the acromioclavicular joint space is widened (it is normally 5 to 8 mm). [9] It can be classified into 6 types.
X-ray at right shows same shoulder after reduction and internal rotation, revealing both a Bankart lesion and a Hill-Sachs lesion. Diagnosis can be suspected by history and physical examination which is usually followed by imaging. Because of the mechanism of injury, apprehension of anterior dislocation is common with provocative maneuvers.
With 120 degrees of unassisted flexion, the shoulder joint is the most mobile joint in the body. Animation of the shoulder joint. The muscles shown are subscapularis muscle (at right), infraspinatus muscle (at top left), teres minor muscle (at bottom left)