Internal glenohumeral impingement

Wondering about the frequency of internal impingement in cases of posterior shoulder pain. Has anyone seen a case of internal impingement in a population other than an overhead athlete or someone performing repetitive overhead lifting? Also wondering about diagnosis, signs, and symptoms of this condition (other than posterior shoulder pain and pain with abd/ER/horiz abd). Thanks.

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Have a look over this information resource for more information.

Eveidence based clinical guidelines for Diagnosis, assessment and physiotherapy management of Shoulder Impingement Syndrome.