A 65-year-old woman presents to her physician after falling. She complains of sever right shoulder pain and inability to lift her arm overhead, with special difficulty with initiating abduction and forward elevation. She has noted shoulder pain and weakness with activity for several years, which is now acutely worsened. What is her most likely injury?

A 65-year-old woman presents to her physician after falling. She complains of sever right shoulder pain and inability to lift her arm overhead, with special difficulty with initiating abduction and forward elevation. She has noted shoulder pain and weakness with activity for several years, which is now acutely worsened. What is her most likely injury?