Reverse total shoulder replacement is a type of shoulder replacement initially designed for the treatment of irreparable rotator cuff tears that have rendered the shoulder joint unstable. This technique reverses the normal anatomy of the shoulder, placing an artificial ball on the socket and an artifical socket on the ball side. This type of replacement creates a more stable shoulder allowing the deltoid muscle to elevate the arm again. The best outcomes are seen in those with “pseudoparalysis” of the shoulder, whereby individuals are unable to raise their arms giving the appearance of a paralyzed shoulder. More recently, it has been used for treatment of failed prior shoulder replacements and severe shoulder fractures in the elderly.