Subacromial impingement syndrome: Pathogenesis, clinical features, and examination methods

Although subacromial impingement syndrome is the most common cause of shoulder pain with a specific diagnosis, it is not the only cause of pain in the anterosuperior aspect of the shoulder. Appreciation of the pathophysiology plays a key role in the diagnosis and management of this syndrome . The purpose of this paper is to review some essential aspects of pathogenesis, physical examination, and diagnosis in the light of the current literature .