Impingement syndrome is when the acromion(bone over the rotator cuff) develops a spur.This spurring closes down the space between the two, causing pain and inflammation of the bursal tissues(bursitis).. . If left untreated,a rotator cuff tear may eventually occur.. . See your orthopedic surgeon when this condition starts to interfere with daily activities.. . The pain and swelling can be relieved with a relatively minor procedure called a decompression acromioplasty.Most surgeons complete this through a shoulder arthroscopy.