x-ray shows an anterior dislocation of the shoulder
Anterior shoulder dislocations usually result from abduction, extension, and external rotation, such as when preparing for a volleyball spike. Falls on an outstretched hand are a common cause in older adults. The humeral head is forced out of the glenohumeral joint, rupturing or detaching the anterior capsule from its attachment to the head of the humerus or from its insertion to the edge of the glenoid fossa. This occurs with or without lateral detachment.
Anterior dislocations account for more than 95% of dislocations, with posterior dislocations making up 4% and inferior dislocations (luxatio erecta) about 0.5%. Superior and intrathoracic dislocations are extremely rare.
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Anterior shoulder dislocations usually result from abduction, extension, and external rotation.
