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Chronic AC - strain
Pain is felt at the tip of the shoulder or in the C4 dermatome
Posttraumatic or as an overuse injury.
A special form of AC- strain is the " distal clavicular osteolysis "
The pain is felt during or after activity.
Full range of movement with pain at the end of ranges.
Sometimes in combination with a painful arc which locates the lesion in the inferior acromio-clavicular ligament.
Local tenderness at the AC-joint if the superior acromioclavicular ligaments are affected.
An additional test (passive horizontal adduction ) is usually the most painful movement.
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