The entity of "Rotator cuff tear arthropathy" describes a condition in which there is a chronic full-thickness rotator cuff tear, with associated erosions of the osseous structures, humeral osteopenia, and restricted painful shoulder motion.The goal of treatment is to restore comfort, motion, strength & stability of the shoulder.Many options were suggested to treat the condition but non of them successeded to reach the expected satisfying results.The reversed shoulder prosthesis successeded to regain a functional range of motion with considerable pain relieve.