Sub Acromial Impingement Syndrome Sub acromial impingement syndrome (SAIS) is a common shoulder disorder and can occur in anyone from the elite level swimmer or tennis player right through to someone who is a little over zealous with their spring cleaning. Pain is caused by a reduction in the available amount of space between the humeral head (top of the arm bone) and acromion (top of the shoulder blade). Many pathologies can…- Read More