Acromioclavicular separations or sprains can vary in severity, depending on the extent of injury to the stabilizing ligaments and capsule.
Depending on the severity of the blow causing the injury, most of the time, only a partial tear of the acromioclavicular ligament will occur. If this is the case then only a first-degree injury is produced.
A second-degree injury occurs when the acromioclavicular ligament is completely torn, but the coracoclavicular ligament remains intact. This can also include subluxation or partial displacement.
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