This condition is the result of an acromioclavicular dislocation that was not reduced. The original injury results from a more severe form of the force that cause an acromioclavicular dislocation, ie a fall on the shoulder. The fall causes sufficient stress to tear the acromioclavicular ligaments and the stronger coracoclavicular ligaments.
The patient presents with a bony prominence.
This condition, though causing deformity, does not result in much disability. An operation is seldom undertaken.
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