The two most common types of shoulder replacements are anatomic and reverse, both of which remove the diseased cartilage and resurface the joint using two artificial components.
An anatomic total shoulder replacement substitutes the ball of the shoulder joint with an artificial implant shaped with a smooth, round metal surface. The socket is replaced with a specialized plastic that is cemented into place. Less commonly, in cases where there is disease only on the humeral side, the ball alone is replaced in a procedure known as a partial replacement or hemiarthroplasty.
In a reverse total shoulder replacement, the normal structure of the shoulder is flipped or “reversed.” The ball portion of the implant is attached to the scapula, and the artificial socket is then attached to the humeral head. This makes the stronger deltoid muscles more effective and increases joint stability. This procedure is commonly utilized in patients with an irreparable rotator cuff or in the context of revision surgery.